Introduce x87 port

src/x87/codegen-x87.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_IA32_CODEGEN_IA32_H_
-#define V8_IA32_CODEGEN_IA32_H_
+#ifndef V8_X87_CODEGEN_X87_H_
+#define V8_X87_CODEGEN_X87_H_
 
 #include "ast.h"
 #include "ic-inl.h"
 
 namespace v8 {
 namespace internal {
 
 
 class StringCharLoadGenerator : public AllStatic {
  public:
   // Generates the code for handling different string types and loading the
   // indexed character into |result|.  We expect |index| as untagged input and
   // |result| as untagged output.
   static void Generate(MacroAssembler* masm,
                        Factory* factory,
                        Register string,
                        Register index,
                        Register result,
                        Label* call_runtime);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StringCharLoadGenerator);
 };
 
-
-class MathExpGenerator : public AllStatic {
- public:
-  static void EmitMathExp(MacroAssembler* masm,
-                          XMMRegister input,
-                          XMMRegister result,
-                          XMMRegister double_scratch,
-                          Register temp1,
-                          Register temp2);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MathExpGenerator);
-};
-
 } }  // namespace v8::internal
 
-#endif  // V8_IA32_CODEGEN_IA32_H_
+#endif  // V8_X87_CODEGEN_X87_H_