Update compile_db.py clang script for Windows.

compile_db.py needs to split commands in non-posix mode on Windows.

Bug: 844348
Change-Id: I5fdcb84fb8ddca7765d5d96b66ee1c54236b9265
Reviewed-on: https://chromium-review.googlesource.com/1107812
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569183}

tools/clang/pylib/clang/compile_db.py

@@ -17,7 +17,7 @@ _debugging = False
 
 def _ProcessEntry(entry):
   """Transforms one entry in the compile database to be clang-tool friendly."""
-  split_command = shlex.split(entry['command'])
+  split_command = shlex.split(entry['command'], posix=(sys.platform != 'win32'))
 
   # Drop gomacc.exe from the front, if present.
   if split_command[0].endswith('gomacc.exe'):