[VPlan] Propagate FastMathFlags from phis to blends (#180226) If a phi has fast math flags, we can propagate it to the widened select. To do this, this patch makes VPPhi and VPBlendRecipe subclasses of VPRecipeWithIRFlags, and propagates it through PlainCFGBuilder and VPPredicator. Alive2 proofs for some of the FMFs (it looks like it can't reason about the full "fast" set yet) nnan: https://alive2.llvm.org/ce/z/f0bRd4 nsz: https://alive2.llvm.org/ce/z/u9P96T The actual motivation for this to eventually be able to move the special casing for tail folding in LoopVectorizationPlanner::addReductionResultComputation into the CFG in #176143, which requires passing through FMFs.
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