Port 5674812c

Original Commit Message:

    At runtime, calls to embedded builtins do not need to take the
    indirection through the off-heap trampoline. We can simply inline the
    trampoline instead.

R=jgruber@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I4b18f3a957a41af28da34b503015271573949888
Reviewed-on: https://chromium-review.googlesource.com/1073193Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#53366}