[PATCH] process the -fno-signed-zeros optimization flag (PR20870)

[Sanjay Patel]

In http://reviews.llvm.org/D6873#112504, @rsmith wrote:

> We have no backwards-compatibility constraints for our `-cc1` interface, so we don't need to keep around the `-cl-no-signed-zeros` flag.


Thanks, Richard! I didn't realize we could just nuke that flag. I went ahead and checked in the patch as-is (r226915), but I can get rid of the cl flag in a subsequent patch. Looks like we can do that for a few of those cl FP flags in one patch.


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http://reviews.llvm.org/D6873

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