Drop -fno-slp-vectorize from the Clang build

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 3647 matching lines @@
               }],
               ['OS=="android"', {
                 'variables': {
                   'release_optimize%': 's',
                 },
                 'ldflags': [
                   # Warn in case of text relocations.
                   '-Wl,--warn-shared-textrel',
                 ],
               }],
-              ['clang==1', {
-                # TODO(thakis): Remove once http://llvm.org/PR20354 is fixed
-                # and the fix is in chromium.
-                'cflags': [ '-fno-slp-vectorize', ],
-              }],
               ['profiling==1', {
                 'cflags': [
                   '-fno-omit-frame-pointer',
                   '-g',
                 ],
                 'conditions' : [
                   ['profiling_full_stack_frames==1', {
                     'cflags': [
                       '-fno-inline',
                       '-fno-optimize-sibling-calls',
@@ skipping 1113 matching lines @@
               # the -Wobjc-missing-property-synthesis flag.
               'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
               'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
               'WARNING_CFLAGS': [
                 # This warns on selectors from Cocoa headers (-length, -set).
                 # cfe-dev is currently discussing the merits of this warning.
                 # TODO(thakis): Reevaluate what to do with this, based one
                 # cfe-dev discussion.
                 '-Wno-selector-type-mismatch',
               ],
-              'OTHER_CFLAGS': [
-                # TODO(thakis): Remove once http://llvm.org/PR20354 is fixed
-                # and the fix is in chromium.
-                '-fno-slp-vectorize',
-              ],
-
               'conditions': [
                 ['clang_xcode==0', {
                   'CC': '$(SOURCE_ROOT)/<(clang_dir)/clang',
                   'LDPLUSPLUS': '$(SOURCE_ROOT)/<(clang_dir)/clang++',
                 }],
               ],
             }],
             ['clang==1 and clang_xcode==0 and clang_use_chrome_plugins==1', {
               'OTHER_CFLAGS': [
                 '<@(clang_chrome_plugins_flags)',
@@ skipping 971 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }