X87: Simplify IC interfaces.

  port 911a5768 (r35301)

  original commit message:

BUG=

Review URL: https://codereview.chromium.org/1888043004

Cr-Commit-Position: refs/heads/master@{#35512}

test/cctest/test-disasm-x87.cc

@@ -290,7 +290,7 @@ TEST(DisasmIa320) {
   __ bind(&L2);
   __ call(Operand(ebx, ecx, times_4, 10000));
   __ nop();
-  Handle<Code> ic(CodeFactory::LoadIC(isolate, NOT_INSIDE_TYPEOF));
+  Handle<Code> ic(CodeFactory::LoadIC(isolate, NOT_INSIDE_TYPEOF).code());
   __ call(ic, RelocInfo::CODE_TARGET);
   __ nop();
   __ call(FUNCTION_ADDR(DummyStaticFunction), RelocInfo::RUNTIME_ENTRY);