port 9c8262f1 (r31120).

    original commit message:
    When calling into C++ builtins, we need to make sure that the argument
    count register contains the correct number of arguments, otherwise the
    CEntryStub will not be able to leave the stack in the correct state.

BUG=

Review URL: https://codereview.chromium.org/1418533009

Cr-Commit-Position: refs/heads/master@{#31503}