[PATCH] Factor out builtin argument range checks

[Richard Sandiford]

SemaChecking.cpp has several copies of the same range-check idiom.
This patch factors them out into a utility function.  No behavioural
change intended.

I need to add something similar for SystemZ and didn't want to add more
copies of the sequence.


http://reviews.llvm.org/D3377

Files:
  include/clang/Sema/Sema.h
  lib/Sema/SemaChecking.cpp
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