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

tools/clang/scripts/update.py

Index: tools/clang/scripts/update.py
diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index dfb55cb78d149867f4e73e85f3871ad972357c10..46aa8be998689bdf63d82671f37582e461a24564 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -279,10 +279,11 @@ def MaybeDownloadHostGcc(args):
 
   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++.