Add X32 port into V8

src/x64/debug-x64.cc

Index: src/x64/debug-x64.cc
===================================================================
--- src/x64/debug-x64.cc	(revision 15486)
+++ src/x64/debug-x64.cc	(working copy)
@@ -95,6 +95,7 @@
 
 
 #define __ ACCESS_MASM(masm)
+#define __q __
 
 
 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
@@ -126,12 +127,21 @@
       }
       // Store the 64-bit value as two smis.
       if ((non_object_regs & (1 << r)) != 0) {
+#ifndef V8_TARGET_ARCH_X32
         __ movq(kScratchRegister, reg);
         __ Integer32ToSmi(reg, reg);
         __ push(reg);
         __ sar(kScratchRegister, Immediate(32));
         __ Integer32ToSmi(kScratchRegister, kScratchRegister);
         __ push(kScratchRegister);
+#else
+        if (FLAG_debug_code) {
+          __ testl(reg, Immediate(0xc0000000));
+          __ Assert(zero, "Unable to encode value as smi");
+        }
+        __ Integer32ToSmi(reg, reg);
+        __ Push(reg);
+#endif
       }
     }
 
@@ -156,12 +166,17 @@
       }
       // Reconstruct the 64-bit value from two smis.
       if ((non_object_regs & (1 << r)) != 0) {
+#ifndef V8_TARGET_ARCH_X32
         __ pop(kScratchRegister);
         __ SmiToInteger32(kScratchRegister, kScratchRegister);
         __ shl(kScratchRegister, Immediate(32));
         __ pop(reg);
         __ SmiToInteger32(reg, reg);
         __ or_(reg, kScratchRegister);
+#else
+        __ Pop(reg);
+        __ SmiToInteger32(reg, reg);
+#endif
       }
     }
 
@@ -176,7 +191,7 @@
   // If this call did not replace a call but patched other code then there will
   // be an unwanted return address left on the stack. Here we get rid of that.
   if (convert_call_to_jmp) {
-    __ addq(rsp, Immediate(kPointerSize));
+    __q addq(rsp, Immediate(kPointerSize));
   }
 
   // Now that the break point has been handled, resume normal execution by
@@ -185,7 +200,11 @@
   ExternalReference after_break_target =
       ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate());
   __ movq(kScratchRegister, after_break_target);
+#ifndef V8_TARGET_ARCH_X32
   __ jmp(Operand(kScratchRegister, 0));
+#else
+  __ Jump(Operand(kScratchRegister, 0));
+#endif
 }
 
 
@@ -354,6 +373,7 @@
 
 const bool Debug::kFrameDropperSupported = true;
 
+#undef __q
 #undef __
 
 #endif  // ENABLE_DEBUGGER_SUPPORT