Qiu Chaofan 1b2fe71ecf [DAGCombiner] Tighten reasscociation of visitFMA
From LangRef, FMF contract should not enable reassociating to form
arbitrary contractions. So it should not help rearrange nodes like
(fma (fmul x, c1), c2, y) into (fma x, c1*c2, y).

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D89527
2020-10-20 10:13:01 +08:00
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