Melanie Blower f4aaed3bf1 Reland D81869 "Modify FPFeatures to use delta not absolute settings" ...

This reverts commit defd43a5b3.
with correction to solve msan report

To solve https://bugs.llvm.org/show_bug.cgi?id=46166 where the
floating point settings in PCH files aren't compatible, rewrite
FPFeatures to use a delta in the settings rather than absolute settings.
With this patch, these floating point options can be benign.

Reviewers: rjmccall

Differential Revision: https://reviews.llvm.org/D81869

2020-06-27 01:34:57 -07:00

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