[SIL Opaque Value] Support checked_cast_br in Address Lowering with loadable source & opaque target type #58441
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atrick
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…oadable source type and opaque target type
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Rewrite checked_cast_br instructions that have a loadable source and opaque target as a post pass. Such instructions are not visited by the UseRewriter. All the uses of the opaque block argument are replaced by the storageAddress assigned during the initial allocation. At the end of AddressLowering such checked_cast_br instructions are rewritten to their address forms using this storage address.