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Reland D74436 "Change clang option -ffp-model=precise to select ffp…

Authored by mibintc on Feb 18 2020, 3:55 AM.

Description

Reland D74436 "Change clang option -ffp-model=precise to select ffp-contract=on"" Change clang option -ffp-model=precise, the default, to select ffp-contract=on The patch caused some problems for PowerPC but ibm has made adjustments so I am resubmitting this patch. Additionally, Andy looked at the performance regressions on LNT and it looks like a loop unrolling decision that could be adjusted.

Reviewers: rjmccall, Andy Kaylor

Differential Revision: https://reviews.llvm.org/D74436