[analyzer] Add support for __builtin_constant_p to BuiltinFunctionChecker

[Felix Kostenzer via cfe-commits]

Hi,

Added evaluation of __builtin_constant_p to the dedicated StaticAnalyzer checker
along with a regression test.

'make clang-test' results:

Testing Time: 335.63s
  Expected Passes : 11769
  Expected Failures : 19
  Unsupported Tests : 50

- felix
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