[cfe-commits] [PATCH] Disallow __has_include and __has_include_next outside of preprocessor directives

[Aaron Ballman]

This patch addresses PR14837, so that __has_include and
__has_include_next do not work outside of preprocessor directives.
This fixes a failing assertion, as well as clarifies the behavior (I
can update the public docs if we think it's desirable).  Patch
Includes test cases.

Thanks!

~Aaron
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