[SLP]Improved/fixed FMAD support in reductions In the initial patch for FMAD, potential FMAD nodes were completely excluded from the reduction analysis for the smaller patch. But it may cause regressions. This patch adds better detection of scalar FMAD reduction operations and tries to correctly calculate the costs of the FMAD reduction operations (also, excluding the costs of the scalar fmuls) and split reduction operations, combined with regular FMADs. Fixed the handling for reduced values with many uses. Reviewers: RKSimon, gregbedwell, hiraditya Reviewed By: RKSimon Pull Request: https://github.com/llvm/llvm-project/pull/152787
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