Port a330af0e

Original commit message:
    The optimized code generated by Crankshaft cannot properly deal
    with proxies (in the prototype chain), and there's probably no
    point in trying to make that work^Wfast with Crankshaft at all.
    TurboFan will handle that properly; Crankshaft just bails out
    to fullcodegen, which then goes to the runtime, which should do
    the right thing soon.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:1543
LOG=n

Review URL: https://codereview.chromium.org/1496843004

Cr-Commit-Position: refs/heads/master@{#32583}