[FuncSpec] Query SCCPSolver in more places (#114964) When traversing the use-def chain of an Argument in a candidate specialization, also query the SCCPSolver to see if a Value is constant. This allows us to better estimate the codesize savings of a candidate in the presence of instructions that are a user of the argument we are estimating savings for which also use arguments that have been found constant by IPSCCP. Similarly when estimating the dead basic blocks from branch and switch instructions which become constant, also query the SCCPSolver to see if a predecessor is unreachable.
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