Separate native and interpreted regexp by compile time flag, not runtime.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index a884d773b1b667199b762deb1d805d6e7f6dd7e8..fddd000289ce6a1a266499e5a7eb7607a1a482f5 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -4892,6 +4892,7 @@ TEST(DebugBreakInMessageHandler) {
 }
 
 
+#ifdef V8_NATIVE_REGEXP
 // Debug event handler which gets the function on the top frame and schedules a
 // break a number of times.
 static void DebugEventDebugBreak(
@@ -4928,11 +4929,10 @@ static void DebugEventDebugBreak(
 
 
 TEST(RegExpDebugBreak) {
+  // This test only applies to native regexps.
   v8::HandleScope scope;
   DebugLocalContext env;
 
-  i::FLAG_regexp_native = true;
-
   // Create a function for checking the function when hitting a break point.
   frame_function_name = CompileFunction(&env,
                                         frame_function_name_source,
@@ -4957,6 +4957,7 @@ TEST(RegExpDebugBreak) {
   CHECK_EQ(20, break_point_hit_count);
   CHECK_EQ("exec", last_function_hit);
 }
+#endif  // V8_NATIVE_REGEXP
 
 
 // Common part of EvalContextData and NestedBreakEventContextData tests.