Removed redundant lines in a comment

@yaxunl, since I'm partially reverting your change https://reviews.llvm.org/D34367 can you give a feedback on this?

@Anastasia @yaxunl
Hi, I am working on generalizing this patch and several questions have raised during this, so I want to discuss them with you:

1. Should #pragma OPENCL EXTENSION ext_name : begin enables the extension as well? For now I see it's not, as an example:

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• Forgot to add clarification comments on conditional branching. Added.

Moved the test to test/Headers/opencl-c-header.cl

In D52658#1252744, @Anastasia wrote:

Does it mean we should close https://reviews.llvm.org/D32896?

@Anastasia , since there is a problem I described, wouldn't you mind if I stay with the first iteration of the patch (adding the extension to OpenCLExtensions.def) and after we'll investigate what is wrong with -cl-ext approach?

getOpenCLExtensionsFromTypeExtMap was added

For now this patch is on hold since it adds no new functionality. Its future will be decided after @asavonic finished https://reviews.llvm.org/D51544

Reference to the Spec was added

Previously this patch was reviewed here: https://reviews.llvm.org/D26794 . I wasn't able to update it, so I created a new one with the comments applied.

I'm not sure if I put pragmas in an appropriate place (I mean in the very beginning of the header).

No, I don't have, commit it please.

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