[X86] combineFaddCFmul - use KnownBits to detect FNEG patterns.
We currently look for X86ISD::VBROADCAST_LOAD patterns, but this won't work with a future patch which will improve sharing of constant pool loads.
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We currently look for X86ISD::VBROADCAST_LOAD patterns, but this won't work with a future patch which will improve sharing of constant pool loads.