This reverts commit 2f79e035.

Reason for revert: Conflicts with successor CL.

Original change's description:
> [builtins] Remove Builtins::Name() accessors
> 
> Instead of auto-generating the Name() convenience accessor, use a macro to
> avoid wasting code space.
> 
>   BUILTIN_CODE(isolate, Name)
> 
> expands to
> 
>   isolate->builtins()->builtin_handle(Builtins::kName);
> 
> This reduces the size of libv8.so by 134,752 bytes on a x64 release build.
> 
> Bug: v8:6624
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
> Change-Id: Idff7ee5c45e344e73412c0f47e92553c7c7ff75f
> Reviewed-on: https://chromium-review.googlesource.com/593607
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#47010}

TBR=yangguo@chromium.org,ahaas@chromium.org,jgruber@chromium.org,bmeurer@chromium.org

Change-Id: Ia9ef5c755b26c3f4e143d87a7c51033614ea435e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6624
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/594048Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47012}