Given an EH pad, find where it unwinds. If it unwinds to an EH pad, return that pad instruction. If it unwinds to caller, return ConstantTokenNone. If it does not have a definitive unwind destination, return nullptr. This routine gets invoked for calls in funclets in inlinees when inlining an invoke. Since many funclets don't have calls inside them, it's queried on-demand rather than building
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