Introduce x87 port

src/x87/lithium-gap-resolver-x87.h

Index: src/x87/lithium-gap-resolver-x87.h
diff --git a/src/ia32/lithium-gap-resolver-ia32.h b/src/x87/lithium-gap-resolver-x87.h
similarity index 94%
copy from src/ia32/lithium-gap-resolver-ia32.h
copy to src/x87/lithium-gap-resolver-x87.h
index 0eca35b39caa21a8e63ba8b7ee1b95969812fadd..dd8be0d53cd499b1fd18b4661ed93c499c57cb14 100644
--- a/src/ia32/lithium-gap-resolver-ia32.h
+++ b/src/x87/lithium-gap-resolver-x87.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
-#define V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
+#ifndef V8_X87_LITHIUM_GAP_RESOLVER_X87_H_
+#define V8_X87_LITHIUM_GAP_RESOLVER_X87_H_
 
 #include "v8.h"
 
@@ -84,4 +84,4 @@ class LGapResolver V8_FINAL BASE_EMBEDDED {
 
 } }  // namespace v8::internal
 
-#endif  // V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
+#endif  // V8_X87_LITHIUM_GAP_RESOLVER_X87_H_