[PATCH] D22334: Fix for Bug 28172 : clang crashes on invalid code (with too few arguments to __builtin_signbit) without any proper diagnostics.

[David Majnemer via cfe-commits]

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I feel like this needs further validation.  For example, we crash on:

  int x = __builtin_signbit("1");


https://reviews.llvm.org/D22334