Direct call to native RegExp code from JavaScript

src/x64/regexp-macro-assembler-x64.h

Index: src/x64/regexp-macro-assembler-x64.h
===================================================================
--- src/x64/regexp-macro-assembler-x64.h	(revision 3531)
+++ src/x64/regexp-macro-assembler-x64.h	(working copy)
@@ -143,6 +143,8 @@
   // AtStart is passed as 32 bit int (values 0 or 1).
   static const int kAtStart = kRegisterOutput + kPointerSize;
   static const int kStackHighEnd = kAtStart + kPointerSize;
+  // DirectCall is passed as 32 bit int (values 0 or 1).
+  static const int kDirectCall = kStackHighEnd + kPointerSize;
 #else
   // In AMD64 ABI Calling Convention, the first six integer parameters
   // are passed as registers, and caller must allocate space on the stack
@@ -154,6 +156,7 @@
   static const int kRegisterOutput = kInputEnd - kPointerSize;
   static const int kAtStart = kRegisterOutput - kPointerSize;
   static const int kStackHighEnd = kFrameAlign;
+  static const int kDirectCall = kStackHighEnd + kPointerSize;
 #endif
 
 #ifdef _WIN64