X87: [stubs] Introduce ToNameStub to implement %_ToName.
port a0878333(r33460) 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. BUG= Review URL: https://codereview.chromium.org/1622793006 Cr-Commit-Position: refs/heads/master@{#33483}
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