Instead of always inlining the polymorphic map checks, this CL
introduces a builtin to perform these polymorphic map checks
when the IC is monomorphic at compile time.

This reduces the time we spend compiling and code bloat while trading it
for performance.

Bug: v8:10582, v8:9684
Change-Id: I7aea698988f8ead3cbf3f4a836218f53223f0f98
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2398525
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70200}