[IR] Simplify dispatchRecalculateHash and dispatchResetHash (NFC) (#159903) This patch simplifies dispatchRecalculateHash and dispatchResetHash with "constexpr if". This patch does not inline dispatchRecalculateHash and dispatchResetHash into their respective call sites. Using "constexpr if" in a non-template context like MDNode::uniquify would still require the discarded branch to be syntactically valid, causing a compilation error for node types that do not have recalculateHash/setHash. Using template functions ensures that the "constexpr if" is evaluated in a proper template context, allowing the compiler to fully discard the inactive branch.
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