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

test/cctest/test-regexp.cc

Index: test/cctest/test-regexp.cc
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index 62597fbe1c519afeb4d3d8a3ead65498feb927d9..33a83c7795315738c49b58d7c3fc097d32c7633c 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -597,6 +597,8 @@ TEST(DispatchTableConstruction) {
 }
 
 
+// Tests of interpreter.
+
 TEST(MacroAssembler) {
   V8::Initialize(NULL);
   byte codes[1024];
@@ -660,8 +662,8 @@ TEST(MacroAssembler) {
   CHECK_EQ(42, captures[0]);
 }
 
-
-#ifdef V8_TARGET_ARCH_IA32  // IA32 only tests.
+#ifdef V8_TARGET_ARCH_IA32  // IA32 Native Regexp only tests.
+#ifdef V8_NATIVE_REGEXP
 
 class ContextInitializer {
  public:
@@ -1284,10 +1286,10 @@ TEST(MacroAssemblerIA32LotsOfRegisters) {
   Top::clear_pending_exception();
 }
 
+#endif  // V8_REGEXP_NATIVE
+#endif  // V8_TARGET_ARCH_IA32
 
 
-#endif  // !defined ARM
-
 TEST(AddInverseToTable) {
   static const int kLimit = 1000;
   static const int kRangeCount = 16;