Specially handle the key of the LoadKeyed and StoreKeyed instruction for x32 port.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index e3b85bee07f95fa7ff8359518f243ba7dea24b86..fd6f17d6e0f8783558b958d5c3020cf63f53c22f 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2126,11 +2126,24 @@ void LChunkBuilder::FindDehoistedKeyDefinitions(HValue* candidate) {
 
 
 LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  ASSERT(instr->key()->representation().IsInteger32());
+  ASSERT((kPointerSize == kInt64Size &&
+          instr->key()->representation().IsInteger32()) ||
+         (kPointerSize == kInt32Size &&
+          instr->key()->representation().IsSmiOrInteger32()));
   ElementsKind elements_kind = instr->elements_kind();
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
+  LOperand* key = NULL;
   LInstruction* result = NULL;
 
+  if (kPointerSize == kInt64Size) {
+    key = UseRegisterOrConstantAtStart(instr->key());
+  } else {
+    bool clobbers_key = ExternalArrayOpRequiresTemp(
+        instr->key()->representation(), elements_kind);
+    key = clobbers_key
+        ? UseTempRegister(instr->key())
+        : UseRegisterOrConstantAtStart(instr->key());
+  }
+
   if ((kPointerSize == kInt64Size) && instr->IsDehoisted()) {
     FindDehoistedKeyDefinitions(instr->key());
   }
@@ -2224,7 +2237,16 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       elements_kind == FLOAT32_ELEMENTS;
   LOperand* val = val_is_temp_register ? UseTempRegister(instr->value())
       : UseRegister(instr->value());
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
+  LOperand* key = NULL;
+  if (kPointerSize == kInt64Size) {
+    key = UseRegisterOrConstantAtStart(instr->key());
+  } else {
+    bool clobbers_key = ExternalArrayOpRequiresTemp(
+        instr->key()->representation(), elements_kind);
+    key = clobbers_key
+        ? UseTempRegister(instr->key())
+        : UseRegisterOrConstantAtStart(instr->key());
+  }
   LOperand* backing_store = UseRegister(instr->elements());
   return new(zone()) LStoreKeyed(backing_store, key, val);
 }