This adds a new TurboFan-based ToIntegerStub, similar to the
ToLengthStub, and uses it whereever we had custom code for %_ToInteger
previously.

R=yangguo@chromium.org
BUG=v8:4587
LOG=n

Review URL: https://codereview.chromium.org/1846683006

Cr-Commit-Position: refs/heads/master@{#35190}