X87: [ic] Use StrictEqual/Equal builtins for CompareIC slow path.

  port d3ed71ed(r42021)

  original commit message:
  Don't fallback to the %StrictEqual / %Equal runtime functions for the
  generic CompareIC slow path, but use the (new) StrictEqual and Equal
  builtins instead. This avoids a performance cliff when mixing input
  types for strict equality sites.

BUG=

Review-Url: https://codereview.chromium.org/2612693002
Cr-Commit-Position: refs/heads/master@{#42080}

src/x87/code-stubs-x87.cc

@@ -1047,9 +1047,11 @@ void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
   if (cc == equal) {
     {
       FrameScope scope(masm, StackFrame::INTERNAL);
-      __ Push(edx);
-      __ Push(eax);
-      __ CallRuntime(strict() ? Runtime::kStrictEqual : Runtime::kEqual);
+      __ Push(esi);
+      __ Call(strict() ? isolate()->builtins()->StrictEqual()
+                       : isolate()->builtins()->Equal(),
+              RelocInfo::CODE_TARGET);
+      __ Pop(esi);
     }
     // Turn true into 0 and false into some non-zero value.
     STATIC_ASSERT(EQUAL == 0);