* Move irregexp backtrack stack to external memory area, instead of the system stack.

src/SConscript

Index: src/SConscript
diff --git a/src/SConscript b/src/SConscript
index c1bd12b46ca8253a08bad91dfcfdd9e3cb611a80..092fe8dae04bc15f05e537d81a2dfbc7ea03f708 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -44,11 +44,11 @@ SOURCES = {
     'interpreter-irregexp.cc', 'jsregexp.cc', 'log.cc', 'mark-compact.cc',
     'messages.cc', 'objects.cc', 'parser.cc', 'property.cc',
     'regexp-macro-assembler.cc', 'regexp-macro-assembler-irregexp.cc',
-    'rewriter.cc', 'runtime.cc', 'scanner.cc', 'scopeinfo.cc', 'scopes.cc',
-    'serialize.cc', 'snapshot-common.cc', 'spaces.cc', 'string-stream.cc',
-    'stub-cache.cc', 'token.cc', 'top.cc', 'unicode.cc', 'usage-analyzer.cc',
-    'utils.cc', 'v8-counters.cc', 'v8.cc', 'v8threads.cc', 'variables.cc',
-    'zone.cc'
+    'regexp-stack.cc', 'rewriter.cc', 'runtime.cc', 'scanner.cc',
+    'scopeinfo.cc', 'scopes.cc', 'serialize.cc', 'snapshot-common.cc',
+    'spaces.cc', 'string-stream.cc', 'stub-cache.cc', 'token.cc', 'top.cc',
+    'unicode.cc', 'usage-analyzer.cc', 'utils.cc', 'v8-counters.cc', 'v8.cc',
+    'v8threads.cc', 'variables.cc', 'zone.cc'
   ],
   'arch:arm':  ['assembler-arm.cc', 'builtins-arm.cc', 'codegen-arm.cc',
       'cpu-arm.cc', 'debug-arm.cc', 'disasm-arm.cc', 'frames-arm.cc',