The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8aa292dd634877fc41e5844af23d1dee28694f41

commit 8aa292dd634877fc41e5844af23d1dee28694f41
Author: thakis <thakis@chromium.org>
Date: Tue Apr 26 00:24:36 2016

roll clang 266460:267383

Also switch to gnuwin-3, which is identical to gnuwin-1
(which is a zip of all binaries from GnuWin32 needed to
run llvm regression tests), except that rm.exe, mv.exe
and find.exe have been replaced with rm.exe, mv.exe,
and find.exe from msys (and three msys dlls needed
to run them have been added).  This new rm.exe is
able to delete paths longer than 260 characters, needed
for clang's Modules/dependency-dump.m test, and the new
mv.exe is needed for ExecutionEngine/OrcMCJIT/load-object-a.ll
which moves long paths around with `find.exe -exec mv.exe`

BUG= 604993 , 603364 

Review URL: https://codereview.chromium.org/1917853002

Cr-Commit-Position: refs/heads/master@{#389632}

[modify] https://crrev.com/8aa292dd634877fc41e5844af23d1dee28694f41/build/common.gypi
[modify] https://crrev.com/8aa292dd634877fc41e5844af23d1dee28694f41/build/config/compiler/BUILD.gn
[modify] https://crrev.com/8aa292dd634877fc41e5844af23d1dee28694f41/tools/clang/scripts/update.py

Hans, Nico,

we would like to have r267784 rolled into Chrome: http://reviews.llvm.org/rL267784

It should speed up LTO devirtualization, see https://crbug.com/601822.
I realize that you have just rolled Clang two days ago, and might not be willing to do it so quickly again. Shall I open a bug for the next roll then?

Optimistically marking this one fixed since the roll has been in for almost two days.

I've filed  crbug.com/607312  for the next one.

Thank you, Hans!