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

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 429d47406beee6ed0c27f71fda590c8859eb0a9c..888c390c94871e41ef897e8ea5914af70638d805 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1608,6 +1608,22 @@ class LLoadRoot V8_FINAL : public LTemplateInstruction<1, 0, 0> {
 };
 
 
+inline static bool ExternalArrayOpRequiresTemp(
+    Representation key_representation,
+    ElementsKind elements_kind) {
+  // Operations that require the key to be divided by two to be converted into
+  // an index cannot fold the scale operation into a load and need an extra
+  // temp register to do the work.
+  return SmiValuesAre31Bits() && key_representation.IsSmi() &&
+      (elements_kind == EXTERNAL_INT8_ELEMENTS ||
+       elements_kind == EXTERNAL_UINT8_ELEMENTS ||
+       elements_kind == EXTERNAL_UINT8_CLAMPED_ELEMENTS ||
+       elements_kind == UINT8_ELEMENTS ||
+       elements_kind == INT8_ELEMENTS ||
+       elements_kind == UINT8_CLAMPED_ELEMENTS);
+}
+
+
 class LLoadKeyed V8_FINAL : public LTemplateInstruction<1, 2, 0> {
  public:
   LLoadKeyed(LOperand* elements, LOperand* key) {