[PATCH] Improved __builtin_constant_p

[Janusz Sobczak]

Hi nlewycky,

Improved __builtin_constant_p() implementation to match GCC closer.
If the compiler cannot confirm that the argument is constant, the function
is lowered to a (new) llvm.is.constant intrinsic and the constantness is
evaluated again after optimisations such as inlining.

Depends on D4276

http://reviews.llvm.org/D4492

Files:
  lib/CodeGen/CGBuiltin.cpp
  test/CodeGen/builtin_constant_p.c
  test/Sema/builtin_constant_p.cpp
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