Craig Topper 724f570ad2 [X86] Add support 'tune' in target attribute ...

This adds parsing and codegen support for tune in target attribute.

I've implemented this so that arch in the target attribute implicitly disables tune from the command line. I'm not sure what gcc does here. But since -march implies -mtune. I assume 'arch' in the target attribute implies tune in the target attribute.

Differential Revision: https://reviews.llvm.org/D86187

2020-08-19 15:58:19 -07:00

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