[llvm-commits] [PATCH][MS][Review request] - Fix index lit tests failing on Windows

[Francois Pichet]

This patch fixes all the index lit tests failing on Win32.

lit index tests were failing on windows because GetPreamblePCHPath was
returning a empty string.
Returning a empty string because when python spawn c-index-test.exe
neither "TMPDIR", "TEMP" or "TMP" are defined as environment
variables.

Then GetPreamblePCHPath  returning "" created a complicated chain of
events leading to a crash. Probably the code should be more robust.

I am not sure if this can be defined as trivial change i can commit
without review?
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