[pattern-match] Make sure that when we are extracting a tuple that we fail if we have a non-instruction result. #29632
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… fail if we have a non-instruction result. The specific problem here is this: ``` sil @builtin_array_opt_index_raw_pointer_to_index_addr_no_crash : $@convention(thin) (Builtin.RawPointer, Builtin. Word) -> Builtin.Word { bb0(%0 : $Builtin.RawPointer, %1 : $Builtin.Word): %2 = index_raw_pointer %0 : $Builtin.RawPointer, %1 : $Builtin.Word %3 = pointer_to_address %2 : $Builtin.RawPointer to [strict] $*Builtin.Word %4 = load %3 : $*Builtin.Word return %4 : $Builtin.Word } ``` before this commit, we unconditionally called getDefiningInstruction when looking at %1. This of course returned a null value causing the compiler to crash in a dyn_cast<TupleExtractInst>(). rdar://59138369
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The specific problem here is this:
before this commit, we unconditionally called getDefiningInstruction when
looking at %1. This of course returned a null value causing the compiler to
crash in a dyn_cast().
rdar://59138369