[cfe-commits] [PATCH] Fix for syntax checking a header file

[Aaron Ballman]

This patch addresses PR13343, where calling the driver with
-fsyntax-only on a header file was creating a PCH file and ignoring
the syntax check.  The fix was to special case a precompile action
with fsyntax-check and set it to have no output file type (instead of
a pch or pth file type).

~Aaron
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