[BE] Accumulator Init Optimization - disable optimization if max_num_imprecise_acc is used for WGMMA #4699
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If max_num_imprecise is set on a WGMMA, the code handling partial accumulation is not prepared for the case that the accumulator use is being controlled at runtime.
To avoid need for adding a select in this very performance-sensitive code, disable the acc init optimization in this case.