Jinsong Ji c125af82a5 [DAGCombine] Check reassoc flags in aggressive fsub fusion
The is from discussion in https://reviews.llvm.org/D104247#inline-993387

The contract and reassoc flags shouldn't imply each other .

All the aggressive fsub fusion reassociate operations,
we should guard them with reassoc flag check.

Reviewed By: mcberg2017

Differential Revision: https://reviews.llvm.org/D104723
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