X87: VectorICs: megamorphic keyed loads in crankshaft don't need a vector.

port 776770c0 (r27827).

original commit message:

  This needs "Pass load ic state through the Oracle"
  (https://codereview.chromium.org/1083933002/) to land first.

BUG=

Review URL: https://codereview.chromium.org/1093433004

Cr-Commit-Position: refs/heads/master@{#27873}

src/x87/lithium-codegen-x87.cc

@@ -3502,7 +3502,7 @@ void LCodeGen::DoLoadKeyedGeneric(LLoadKeyedGeneric* instr) {
   DCHECK(ToRegister(instr->object()).is(LoadDescriptor::ReceiverRegister()));
   DCHECK(ToRegister(instr->key()).is(LoadDescriptor::NameRegister()));
 
-  if (FLAG_vector_ics) {
+  if (instr->hydrogen()->HasVectorAndSlot()) {
     EmitVectorLoadICRegisters<LLoadKeyedGeneric>(instr);
   }