Skip built-in and debugger functions when DebugBreak is forced

src/ia32/regexp-macro-assembler-ia32.cc

Index: src/ia32/regexp-macro-assembler-ia32.cc
===================================================================
--- src/ia32/regexp-macro-assembler-ia32.cc	(revision 2523)
+++ src/ia32/regexp-macro-assembler-ia32.cc	(working copy)
@@ -634,11 +634,9 @@
   __ push(Immediate(0));  // Make room for "input start - 1" constant.
 
   // Check if we have space on the stack for registers.
-  Label retry_stack_check;
   Label stack_limit_hit;
   Label stack_ok;
 
-  __ bind(&retry_stack_check);
   ExternalReference stack_guard_limit =
       ExternalReference::address_of_stack_guard_limit();
   __ mov(ecx, esp);
@@ -658,10 +656,7 @@
   CallCheckStackGuardState(ebx);
   __ or_(eax, Operand(eax));
   // If returned value is non-zero, we exit with the returned value as result.
-  // Otherwise it was a preemption and we just check the limit again.
-  __ j(equal, &retry_stack_check);
-  // Return value was non-zero. Exit with exception or retry.
-  __ jmp(&exit_label_);
+  __ j(not_zero, &exit_label_);
 
   __ bind(&stack_ok);
 
@@ -762,19 +757,11 @@
     __ push(backtrack_stackpointer());
     __ push(edi);
 
-    Label retry;
-
-    __ bind(&retry);
     CallCheckStackGuardState(ebx);
     __ or_(eax, Operand(eax));
     // If returning non-zero, we should end execution with the given
     // result as return value.
     __ j(not_zero, &exit_label_);
-    // Check if we are still preempted.
-    ExternalReference stack_guard_limit =
-        ExternalReference::address_of_stack_guard_limit();
-    __ cmp(esp, Operand::StaticVariable(stack_guard_limit));
-    __ j(below_equal, &retry);
 
     __ pop(edi);
     __ pop(backtrack_stackpointer());