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

src/regexp-macro-assembler-tracer.cc

Index: src/regexp-macro-assembler-tracer.cc
diff --git a/src/regexp-macro-assembler-tracer.cc b/src/regexp-macro-assembler-tracer.cc
index 2eb7ec58f3e9f51e5549b2bd0e1222005b7b024e..0ae148c8241d3ac0bf5cdb2a672e2a21d4f72eea 100644
--- a/src/regexp-macro-assembler-tracer.cc
+++ b/src/regexp-macro-assembler-tracer.cc
@@ -76,9 +76,11 @@ void RegExpMacroAssemblerTracer::PopCurrentPosition() {
 }
 
 
-void RegExpMacroAssemblerTracer::PushCurrentPosition() {
-  PrintF(" PushCurrentPosition();\n");
-  assembler_->PushCurrentPosition();
+void RegExpMacroAssemblerTracer::PushCurrentPosition(
+    StackCheckFlag check_stack_limit) {
+  PrintF(" PushCurrentPosition(%s);\n",
+         check_stack_limit ? "check stack limit" : "");
+  assembler_->PushCurrentPosition(check_stack_limit);
 }
 
 
@@ -94,9 +96,13 @@ void RegExpMacroAssemblerTracer::GoTo(Label* label) {
 }
 
 
-void RegExpMacroAssemblerTracer::PushBacktrack(Label* label) {
-  PrintF(" PushBacktrack(label[%08x]);\n", label);
-  assembler_->PushBacktrack(label);
+void RegExpMacroAssemblerTracer::PushBacktrack(
+    Label* label,
+    StackCheckFlag check_stack_limit) {
+  PrintF(" PushBacktrack(label[%08x], %s);\n",
+         label,
+         check_stack_limit ? "check stack limit" : "");
+  assembler_->PushBacktrack(label, check_stack_limit);
 }
 
 
@@ -118,9 +124,13 @@ void RegExpMacroAssemblerTracer::PopRegister(int register_index) {
 }
 
 
-void RegExpMacroAssemblerTracer::PushRegister(int register_index) {
-  PrintF(" PushRegister(register=%d);\n", register_index);
-  assembler_->PushRegister(register_index);
+void RegExpMacroAssemblerTracer::PushRegister(
+    int register_index,
+    StackCheckFlag check_stack_limit) {
+  PrintF(" PushRegister(register=%d, %s);\n",
+         register_index,
+         check_stack_limit ? "check stack limit" : "");
+  assembler_->PushRegister(register_index, check_stack_limit);
 }