[CodeExtractor] Reset stale FuncRetVal in findInputsOutputs (#195484) HotColdSplitting calls findInputsOutputs once for cost analysis before extractCodeRegion runs normalizeCFGForExtraction. The first call may set FuncRetVal to a single-output value which severSplitPHINodesOfEntry then moves back into the parent function. The second findInputsOutputs call correctly finds zero outputs but leaves FuncRetVal pointing at the parent's instruction, so the cold function emits a `ret` referencing a value in another function and fails verification. Reset FuncRetVal at the start of the selection block so each call recomputes it from the current CFG. rdar://176075761
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