Merging r294313:

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r294313 | stulova | 2017-02-07 11:09:41 -0500 (Tue, 07 Feb 2017) | 9 lines

[OpenCL] Accept logical NOT for pointer types in CL1.1

Fix for bug 30217 - incorrect error given for logical
NOT operation with a pointer type: corrected sema check
and improved related tests.

Review: D29038

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llvm-svn: 303161