[BranchFolding] Follow up #149999 crash fix fbf6271c7da20356d7b34583b3711b4126ca1dbb introduced an assertion failure as setDebugValueUndef was called on DBG_LABELs, which isn't allowed and doesn't make sense. Fix by skipping the call for DBG_LABELs and hoisting, in line with the original behaviour.
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