Revert change r12912 due to x64 perf issue

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 18741d1fca2cf9488fc18a2f7ba8dc775a221c49..88b1ef01ea04092fc083f07b3b662abb3849af7c 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1408,16 +1408,13 @@ class LLoadKeyed: public LTemplateInstruction<1, 2, 0> {
 };
 
 
-template <class T>
-inline static bool ExternalArrayOpRequiresTemp(T* value) {
-  CHECK(value->IsLoadKeyed() || value->IsStoreKeyed());
-  Representation key_representation = value->key()->representation();
-  ElementsKind elements_kind = value->elements_kind();
-
+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 !value->IsConstant() && key_representation.IsTagged() &&
+  return key_representation.IsTagged() &&
       (elements_kind == EXTERNAL_BYTE_ELEMENTS ||
        elements_kind == EXTERNAL_UNSIGNED_BYTE_ELEMENTS ||
        elements_kind == EXTERNAL_PIXEL_ELEMENTS);