Start landing build support for Clang-style ASan on Windows

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 7d0585966d17c3a254b1521604de6cd5b3c83539..8a7b7c7f041498782d94b63b6514c983a9b87177 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -15,7 +15,7 @@ import sys
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
 # Note: this revision is only used for Windows. Other platforms use update.sh.
-LLVM_WINDOWS_REVISION = '201116'
+LLVM_WINDOWS_REVISION = '201117'
 
 # Path constants. (All of these should be absolute paths.)
 THIS_DIR = os.path.abspath(os.path.dirname(__file__))
@@ -131,11 +131,12 @@ def UpdateClang():
     # If CMake is not on the path, try looking in a standard location.
     os.environ['PATH'] += os.pathsep + 'C:\\Program Files (x86)\\CMake 2.8\\bin'
 
-  RunCommand(GetVSVersion().SetupScript('x64') +
+  # TODO(hans): Do an amd64 build once that supports building ASan runtime.
+  RunCommand(GetVSVersion().SetupScript('x86') +
              ['&&', 'cmake', '-GNinja', '-DCMAKE_BUILD_TYPE=Release',
               '-DLLVM_ENABLE_ASSERTIONS=ON', LLVM_DIR])
 
-  RunCommand(GetVSVersion().SetupScript('x64') + ['&&', 'ninja', 'all'])
+  RunCommand(GetVSVersion().SetupScript('x86') + ['&&', 'ninja', 'all'])
 
   WriteStampFile(LLVM_WINDOWS_REVISION)
   print 'Clang update was successful.'