[X86] Remove mul-constant-optimization flag (#229376) The flags doesn't give us complete control as there's a lot of crossover with other folds, some generic, some in X86DAGToDAGISel and X86FixupLEAs. Without it we have partial control based off minsize builds and the Slow LEA tuning flags, but tbh I'd prefer this fold wasn't in the DAG at all, but scheduler driven in MachineCombiner or X86FixupLEAs.
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