SIL: Adjust pack isa after upstream LLVM implementation change
#85971
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See llvm/llvm-project#161403.
These
isacalls with aCanTypeno longer compile with LLVM next because the implementation now unfolds directly toCastInfocalls rather than non-variadicisacalls that resolve to our partial specializations here:swift/include/swift/AST/Type.h
Line 600 in e293876
We should partially specialize
CastInfoinstead ofisaet al. For now, just use the non-variadicisa.