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Improve handling of floating point literals in OpenCL to only use double…

Authored by neil.hickey on Dec 13 2016, 8:22 AM.

Description

Improve handling of floating point literals in OpenCL to only use double precision if the target supports fp64.

This change makes sure single-precision floating point types are used if the
cl_fp64 extension is not supported by the target.

Also removed the check to see whether the OpenCL version is >= 1.2, as this has
been incorporated into the extension setting code.

Differential Revision: https://reviews.llvm.org/D24235

llvm-svn: 289544