Fix Xcode project:

tools/v8.xcodeproj/project.pbxproj

 // !$*UTF8*$!
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@@ skipping 14 matching lines @@
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@@ skipping 205 matching lines @@
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                         proxyType = 1;
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                 8900116B0E71CA2300F91F35 /* libraries.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = libraries.cc; sourceTree = "<group>"; };
+                8944AD0E0F1D4D3A0028D560 /* regexp-stack.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = "regexp-stack.cc"; sourceTree = "<group>"; };
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@@ skipping 451 matching lines @@
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                                 89A15C730EE466D000B48DEB /* regexp-macro-assembler-ia32.h */,
                                 89A15C740EE466D000B48DEB /* regexp-macro-assembler-irregexp-inl.h */,
                                 89A15C750EE466D000B48DEB /* regexp-macro-assembler-irregexp.cc */,
                                 89A15C760EE466D000B48DEB /* regexp-macro-assembler-irregexp.h */,
                                 89A15C770EE466D000B48DEB /* regexp-macro-assembler-tracer.cc */,
                                 89A15C780EE466D000B48DEB /* regexp-macro-assembler-tracer.h */,
                                 89A15C790EE466D000B48DEB /* regexp-macro-assembler.cc */,
                                 89A15C7A0EE466D000B48DEB /* regexp-macro-assembler.h */,
+                                8944AD0E0F1D4D3A0028D560 /* regexp-stack.cc */,
+                                8944AD0F0F1D4D3A0028D560 /* regexp-stack.h */,
                                 897FF16F0E719B8F00D62E90 /* rewriter.cc */,
                                 897FF1700E719B8F00D62E90 /* rewriter.h */,
                                 897FF1710E719B8F00D62E90 /* runtime.cc */,
                                 897FF1720E719B8F00D62E90 /* runtime.h */,
                                 897FF1730E719B8F00D62E90 /* scanner.cc */,
                                 897FF1740E719B8F00D62E90 /* scanner.h */,
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                                 897FF1770E719B8F00D62E90 /* scopeinfo.h */,
                                 897FF1780E719B8F00D62E90 /* scopes.cc */,
@@ skipping 337 matching lines @@
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                                 89A88E140E71A6870043BA31 /* objects.cc in Sources */,
                                 89A88E150E71A68C0043BA31 /* parser.cc in Sources */,
                                 89A88E160E71A68E0043BA31 /* platform-macos.cc in Sources */,
                                 89A88E170E71A6950043BA31 /* prettyprinter.cc in Sources */,
                                 89A88E180E71A6960043BA31 /* property.cc in Sources */,
                                 89A15C7B0EE466EB00B48DEB /* regexp-macro-assembler-ia32.cc in Sources */,
                                 89A15C830EE4675E00B48DEB /* regexp-macro-assembler-irregexp.cc in Sources */,
                                 89A15C8A0EE467D100B48DEB /* regexp-macro-assembler-tracer.cc in Sources */,
                                 89A15C810EE4674900B48DEB /* regexp-macro-assembler.cc in Sources */,
+                                8944AD100F1D4D500028D560 /* regexp-stack.cc in Sources */,
                                 89A88E190E71A6970043BA31 /* rewriter.cc in Sources */,
                                 89A88E1A0E71A69B0043BA31 /* runtime.cc in Sources */,
                                 89A88E1B0E71A69D0043BA31 /* scanner.cc in Sources */,
                                 89A88E1C0E71A69E0043BA31 /* scopeinfo.cc in Sources */,
                                 89A88E1D0E71A6A00043BA31 /* scopes.cc in Sources */,
                                 89A88E1E0E71A6A30043BA31 /* serialize.cc in Sources */,
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                                 89A88E200E71A6B60043BA31 /* snapshot-empty.cc in Sources */,
                                 89A88E210E71A6B70043BA31 /* spaces.cc in Sources */,
                                 89A88E220E71A6BC0043BA31 /* string-stream.cc in Sources */,
@@ skipping 82 matching lines @@
                                 89F23C670E78D5B2006B2466 /* objects-debug.cc in Sources */,
                                 89F23C680E78D5B2006B2466 /* objects.cc in Sources */,
                                 89F23C690E78D5B2006B2466 /* parser.cc in Sources */,
                                 89F23C6A0E78D5B2006B2466 /* platform-macos.cc in Sources */,
                                 89F23C6B0E78D5B2006B2466 /* prettyprinter.cc in Sources */,
                                 89F23C6C0E78D5B2006B2466 /* property.cc in Sources */,
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                                 890A14020EE9C4B400E49346 /* regexp-macro-assembler-irregexp.cc in Sources */,
                                 890A14030EE9C4B500E49346 /* regexp-macro-assembler-tracer.cc in Sources */,
                                 890A14040EE9C4B700E49346 /* regexp-macro-assembler.cc in Sources */,
+                                8944AD110F1D4D570028D560 /* regexp-stack.cc in Sources */,
                                 89F23C6D0E78D5B2006B2466 /* rewriter.cc in Sources */,
                                 89F23C6E0E78D5B2006B2466 /* runtime.cc in Sources */,
                                 89F23C6F0E78D5B2006B2466 /* scanner.cc in Sources */,
                                 89F23C700E78D5B2006B2466 /* scopeinfo.cc in Sources */,
                                 89F23C710E78D5B2006B2466 /* scopes.cc in Sources */,
                                 89F23C720E78D5B2006B2466 /* serialize.cc in Sources */,
                                 89F23C9F0E78D604006B2466 /* simulator-arm.cc in Sources */,
                                 89F23C730E78D5B2006B2466 /* snapshot-common.cc in Sources */,
                                 89F23C740E78D5B2006B2466 /* snapshot-empty.cc in Sources */,
                                 89F23C750E78D5B2006B2466 /* spaces.cc in Sources */,
@@ skipping 338 matching lines @@
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                         );
                         defaultConfigurationIsVisible = 0;
                         defaultConfigurationName = Release;
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