Add X32 port into V8

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
===================================================================
--- src/x64/macro-assembler-x64.h	(revision 15486)
+++ src/x64/macro-assembler-x64.h	(working copy)
@@ -662,9 +662,16 @@
 
   // Shifts a smi value to the left, and returns the result if that is a smi.
   // Uses and clobbers rcx, so dst may not be rcx.
+#ifndef V8_TARGET_ARCH_X32
   void SmiShiftLeft(Register dst,
                     Register src1,
                     Register src2);
+#else
+  void SmiShiftLeft(Register dst,
+                    Register src1,
+                    Register src2,
+                    Label* on_not_smi_result);
+#endif
   // Shifts a smi value to the right, shifting in zero bits at the top, and
   // returns the unsigned intepretation of the result if that is a smi.
   // Uses and clobbers rcx, so dst may not be rcx.
@@ -719,6 +726,15 @@
     movq(dst, constant);
   }
 
+#ifdef V8_TARGET_ARCH_X32
+  void Push(Immediate value);
+  void Push_imm32(int32_t imm32);
+  void Push(Register src);
+  void Push(const Operand& src);
+  void Pop(Register dst);
+  void Pop(const Operand& dst);
+#endif
+
   void Push(Smi* smi);
   void Test(const Operand& dst, Smi* source);
 
@@ -769,7 +785,11 @@
 
   // Load a register with a long value as efficiently as possible.
   void Set(Register dst, int64_t x);
+#ifndef V8_TARGET_ARCH_X32
   void Set(const Operand& dst, int64_t x);
+#else
+  void Set(const Operand& dst, int32_t x);
+#endif
 
   // Move if the registers are not identical.
   void Move(Register target, Register source);
@@ -827,10 +847,16 @@
   // Control Flow
   void Jump(Address destination, RelocInfo::Mode rmode);
   void Jump(ExternalReference ext);
+#ifdef V8_TARGET_ARCH_X32
+  void Jump(const Operand& src);
+#endif
   void Jump(Handle<Code> code_object, RelocInfo::Mode rmode);
 
   void Call(Address destination, RelocInfo::Mode rmode);
   void Call(ExternalReference ext);
+#ifdef V8_TARGET_ARCH_X32
+  void Call(const Operand& op);
+#endif
   void Call(Handle<Code> code_object,
             RelocInfo::Mode rmode,
             TypeFeedbackId ast_id = TypeFeedbackId::None());
@@ -1379,7 +1405,7 @@
   // modified. It may be the "smi 1 constant" register.
   Register GetSmiConstant(Smi* value);
 
-  intptr_t RootRegisterDelta(ExternalReference other);
+  int64_t RootRegisterDelta(ExternalReference other);
 
   // Moves the smi value to the destination register.
   void LoadSmiConstant(Register dst, Smi* value);