Add X32 port into V8

src/x64/lithium-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 328 matching lines @@
 
   stream->Add(" length ");
   length()->PrintTo(stream);
 
   stream->Add(" index ");
   index()->PrintTo(stream);
 }
 
 
 int LPlatformChunk::GetNextSpillIndex(bool is_double) {
+#ifdef V8_TARGET_ARCH_X32
+  // Skip a slot if for a double-width slot.
+  // TODO(haitao): Support aligned spilled doubles.
+  if (is_double) {
+    spill_slot_count_++;
+    spill_slot_count_ |= 1;
+  }
+#endif
   return spill_slot_count_++;
 }
 
 
 LOperand* LPlatformChunk::GetNextSpillSlot(bool is_double) {
   // All stack slots are Double stack slots on x64.
   // Alternatively, at some point, start using half-size
   // stack slots for int32 values.
   int index = GetNextSpillIndex(is_double);
   if (is_double) {
@@ skipping 2208 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64