clang update.py: Use a gcc4.8.2 that was prebuilt on Precise.

tools/clang/scripts/update.py

 #!/usr/bin/env python
 # 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.
 
 """This script is used to download prebuilt clang binaries.
 
 It is also used by package.py to build the prebuilt clang binaries."""
 
 import argparse
@@ skipping 261 matching lines @@
     f.write('endif (CHROMIUM_TOOLS_SRC)\n')
 
 
 def MaybeDownloadHostGcc(args):
   """Downloads gcc 4.8.2 if needed and makes sure args.gcc_toolchain is set."""
   if not sys.platform.startswith('linux') or args.gcc_toolchain:
     return
 
   if subprocess.check_output(['gcc', '-dumpversion']).rstrip() < '4.7.0':
     # We need a newer gcc version.
-    gcc_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'gcc482')
+    gcc_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'gcc482precise')
     if not os.path.exists(gcc_dir):
       print 'Downloading pre-built GCC 4.8.2...'
-      DownloadAndUnpack(CDS_URL + '/tools/gcc482.tgz', LLVM_BUILD_TOOLS_DIR)
+      DownloadAndUnpack(
+          CDS_URL + '/tools/gcc482precise.tgz', LLVM_BUILD_TOOLS_DIR)
     args.gcc_toolchain = gcc_dir
   else:
     # Always set gcc_toolchain; llvm-symbolizer needs the bundled libstdc++.
     args.gcc_toolchain = \
         os.path.dirname(os.path.dirname(distutils.spawn.find_executable('gcc')))
 
 
 def AddCMakeToPath():
   """Download CMake and add it to PATH."""
   if sys.platform == 'win32':
@@ skipping 513 matching lines @@
     args.force_local_build = True
     if 'OS=android' not in os.environ.get('GYP_DEFINES', ''):
       # Only build the Android ASan rt on ToT bots when targetting Android.
       args.with_android = False
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())