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

src/regexp-macro-assembler-irregexp.cc

Index: src/regexp-macro-assembler-irregexp.cc
diff --git a/src/regexp-macro-assembler-irregexp.cc b/src/regexp-macro-assembler-irregexp.cc
index e2bed27ee40b1e4523a89e120904b3f3b9468da4..552eb1d4dc958a4d08f0e93dc6e238d777a527b8 100644
--- a/src/regexp-macro-assembler-irregexp.cc
+++ b/src/regexp-macro-assembler-irregexp.cc
@@ -89,7 +89,9 @@ void RegExpMacroAssemblerIrregexp::PopRegister(int register_index) {
 }
 
 
-void RegExpMacroAssemblerIrregexp::PushRegister(int register_index) {
+void RegExpMacroAssemblerIrregexp::PushRegister(
+    int register_index,
+    StackCheckFlag check_stack_limit) {
   ASSERT(register_index >= 0);
   Emit(BC_PUSH_REGISTER);
   Emit(register_index);
@@ -150,7 +152,8 @@ void RegExpMacroAssemblerIrregexp::PopCurrentPosition() {
 }
 
 
-void RegExpMacroAssemblerIrregexp::PushCurrentPosition() {
+void RegExpMacroAssemblerIrregexp::PushCurrentPosition(
+    StackCheckFlag check_stack_limit) {
   Emit(BC_PUSH_CP);
   Emit32(0);  // Current position offset.
 }
@@ -167,7 +170,9 @@ void RegExpMacroAssemblerIrregexp::GoTo(Label* l) {
 }
 
 
-void RegExpMacroAssemblerIrregexp::PushBacktrack(Label* l) {
+void RegExpMacroAssemblerIrregexp::PushBacktrack(
+    Label* l,
+    StackCheckFlag check_stack_limit) {
   Emit(BC_PUSH_BT);
   EmitOrLink(l);
 }