From crrev.com/c/1059108, the following approaches seem suitable:

- Replacing \ with another character during arg splitting. Has the complexity of needing to make sure r'\ ' and r'\"' are correctly handled... and definitely hacky.
- Trying to use shell=True with subprocess.Popen so we don't need to split
- Reimplementing shlex.split ourselves was another option as well.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d050260a870fa65c72a0262b1e954ec90015d2c4

commit d050260a870fa65c72a0262b1e954ec90015d2c4
Author: Ramin Halavati <rhalavati@chromium.org>
Date: Thu Jun 21 07:58:55 2018

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}
[modify] https://crrev.com/d050260a870fa65c72a0262b1e954ec90015d2c4/tools/clang/pylib/clang/compile_db.py

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