Move regexp implementation into its own folder.

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

Index: src/regexp/ia32/regexp-macro-assembler-ia32.h
diff --git a/src/ia32/regexp-macro-assembler-ia32.h b/src/regexp/ia32/regexp-macro-assembler-ia32.h
similarity index 97%
rename from src/ia32/regexp-macro-assembler-ia32.h
rename to src/regexp/ia32/regexp-macro-assembler-ia32.h
index 038c1a973bf0c1d6faf40e3577b2aeee10cb1519..8ec0a9e543d665d5b177518b988bffcebbc60bcf 100644
--- a/src/ia32/regexp-macro-assembler-ia32.h
+++ b/src/regexp/ia32/regexp-macro-assembler-ia32.h
@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
-#define V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
+#ifndef V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
+#define V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
 
 #include "src/ia32/assembler-ia32.h"
 #include "src/macro-assembler.h"
+#include "src/regexp/regexp-macro-assembler.h"
 
 namespace v8 {
 namespace internal {
@@ -197,4 +198,4 @@ class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler {
 
 }}  // namespace v8::internal
 
-#endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
+#endif  // V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_