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

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index c56eb2f73194c0acabcde00456142c37cd0ec522..ad4b24cc16902603d9361a6db9e957d1b71c09db 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -41,6 +41,7 @@
 #include "runtime.h"
 #include "serialize.h"
 #include "stub-cache.h"
+#include "regexp-stack.h"
 
 namespace v8 { namespace internal {
 
@@ -551,6 +552,11 @@ ExternalReference ExternalReference::address_of_stack_guard_limit() {
 }
 
 
+ExternalReference ExternalReference::address_of_regexp_stack_limit() {
+  return ExternalReference(RegExpStack::limit_address());
+}
+
+
 ExternalReference ExternalReference::debug_break() {
   return ExternalReference(FUNCTION_ADDR(Debug::Break));
 }