Faster string.replace with regexp pattern.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 5b1e0b3adcf5460d7acd1c4c68767ba18a905652..de5b1ddbef73a15f66ab873b0df011caaff34aa1 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -30,6 +30,7 @@
 #include "disassembler.h"
 #include "disasm.h"
 #include "macro-assembler.h"
+#include "jsregexp.h"
 
 namespace v8 { namespace internal {
 
@@ -696,11 +697,8 @@ void JSRegExp::JSRegExpVerify() {
       break;
     }
     case JSRegExp::IRREGEXP: {
-      bool is_native = FLAG_regexp_native;
-#ifdef ARM
-      // No native regexp on arm yet.
-      is_native = false;
-#endif
+      bool is_native = RegExpImpl::UseNativeRegexp();
+
       FixedArray* arr = FixedArray::cast(data());
       Object* ascii_data = arr->get(JSRegExp::kIrregexpASCIICodeIndex);
       ASSERT(ascii_data->IsTheHole()