Port a0878333

Original commit message:
    We already had hand-written optimized code for %_ToName in fullcodegen,
    but the optimizing compilers always went to the runtime for %_ToName,
    which is pretty bad for many of our builtins. So this CL moves the
    existing native code to a ToNameStub (similar to the existing
    ToStringStub), and uses the ToNameStub consistently in all compilers to
    actually implement %_ToName.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1620313004

Cr-Commit-Position: refs/heads/master@{#33476}