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Revert of Roll Clang 223108:228129 (patchset #5 id:80001 of https://codereview.chromium.org/881763003/)

Reason for revert:
compiler crash in http://build.chromium.org/p/chromium/builders/Mac/builds/33226

Assertion failed: (Offset <= PieceOffset && "overlapping or duplicate pieces"), function emitLocPieces, file /work/chromium/src/third_party/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp, line 1676.

0.	Program arguments: /Volumes/data/b/build/slave/Mac/build/src/third_party/llvm-build/Release+Asserts/bin/clang -cc1 -triple x86_64-apple-macosx10.6.0 /* snip */ -x c ../../third_party/mesa/src/src/mesa/program/prog_opt_constant_fold.c
1.	<eof> parser at end of file
2.	Code generation
clang:error: unable to execute command: Illegal instruction: 4
clang:error: clang frontend command failed due to signal (use -v to see invocation)
clang version 3.7.0 (trunk 228129)
Target: x86_64-apple-darwin13.4.0

Original issue's description:
> Roll Clang 223108:228129
>
> Also introduce a build number in the package name, stop versioning
> the Blink GC plugin, and remove repackage.sh.
>
> BUG=444089
>
> Committed: https://crrev.com/d30327adf468b78f79819a69bca12b64b7cb70ae
> Cr-Commit-Position: refs/heads/master@{#314946}

TBR=thakis@chromium.org,jln@chromium.org,jbauman@chromium.org,hans@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=444089

Review URL: https://codereview.chromium.org/898713004

Cr-Commit-Position: refs/heads/master@{#314950}