[PATCH] Fix OpenCL 1.2 double as an optional core feature behaviour

[Neil Henning]

Hi rsmith,

In OpenCL 1.2, using double no longer requires using the pragma cl_khr_fp64, instead a kernel is allowed to use double, but must first have queried clGetDeviceInfo's CL_DEVICE_DOUBLE_FP_CONFIG.

Page 197, section 6.1.1 of the OpenCL 1.2 specification has a footnote 23 describing this behaviour.

I've also added test cases such that the pragma must be used if targeting OpenCL 1.0 or 1.1, but is ignored in 1.2 and 2.0.

http://reviews.llvm.org/D7245

Files:
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaType.cpp
  test/SemaOpenCL/extension-fp64-cl1.1.cl
  test/SemaOpenCL/optional-core-fp64-cl1.2.cl
  test/SemaOpenCL/optional-core-fp64-cl2.0.cl

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