[stubs] Remove the is_jsarray bit from the TransitionElementsKindStub.

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index 0bf324381c7f3fe63a7261b1d513ec9df3914ace..7d3398ee671eed71cee0cb4aa69bc1b7cf5d023b 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -4296,8 +4296,7 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
     DCHECK(ToRegister(instr->context()).is(rsi));
     PushSafepointRegistersScope scope(this);
     __ Move(rbx, to_map);
-    bool is_js_array = from_map->instance_type() == JS_ARRAY_TYPE;
-    TransitionElementsKindStub stub(isolate(), from_kind, to_kind, is_js_array);
+    TransitionElementsKindStub stub(isolate(), from_kind, to_kind);
     __ CallStub(&stub);
     RecordSafepointWithLazyDeopt(instr, RECORD_SAFEPOINT_WITH_REGISTERS, 0);
   }