Support non-type template parameters in #pragma loop

[Tyler Nowicki]

Hi,

As requested here is the patch to support non-type template parameters in #pragma loop. The patch uses LookupName to build a DeclRefExpr to the template parameter and overloads TransformAttr in the template instantiator to transform the value expression and replace the LoopHintAttr. It is built on the PragmaAttr and Pragma Spelling patch listed in the 'Add PragmaAttr and Pragma Spelling to Tablegen’ thread. Since it is a git patch please use ‘patch -p1’ to apply it.

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Thanks,

Tyler