roll clang 176256:179138

BUG=233709
TBR=hans
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=195220

Review URL: https://chromiumcodereview.appspot.com/14169006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195379 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -2969,6 +2969,13 @@
               '-Xclang', '-add-plugin', '-Xclang', '<(clang_add_plugin)',
             ],
           }],
+          ['clang==1 and target_arch=="ia32"', {
+            'cflags': [
+              # Else building libyuv gives clang's register allocator issues,
+              # see llvm.org/PR15798 / crbug.com/233709
+              '-momit-leaf-frame-pointer',
+            ],
+          }],
           ['clang==1 and "<(GENERATOR)"=="ninja"', {
             'cflags': [
               # See http://crbug.com/110262

tools/clang/scripts/update.sh

@@ -8,7 +8,7 @@
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION=176256
+CLANG_REVISION=179138
 # ASan Mac builders are pinned to this revision, see http://crbug.com/170629.
 CLANG_ASAN_MAC_REVISION=170392