Make not sucking at regexp the default...

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

Index: src/ia32/regexp-macro-assembler-ia32.h
===================================================================
--- src/ia32/regexp-macro-assembler-ia32.h	(revision 4367)
+++ src/ia32/regexp-macro-assembler-ia32.h	(working copy)
@@ -31,14 +31,14 @@
 namespace v8 {
 namespace internal {
 
-#ifndef V8_NATIVE_REGEXP
+#ifdef V8_INTERPRETED_REGEXP
 class RegExpMacroAssemblerIA32: public RegExpMacroAssembler {
  public:
   RegExpMacroAssemblerIA32() { }
   virtual ~RegExpMacroAssemblerIA32() { }
 };
 
-#else
+#else  // V8_INTERPRETED_REGEXP
 class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler {
  public:
   RegExpMacroAssemblerIA32(Mode mode, int registers_to_save);
@@ -208,7 +208,7 @@
   Label check_preempt_label_;
   Label stack_overflow_label_;
 };
-#endif  // V8_NATIVE_REGEXP
+#endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal