[TargetLowering] Use Correct VT for Multi-out Asm (#116024)

This was overlooked in 7d940432c46be83b8fcb5dbefee439585fa820cd - when
inline assembly has multiple outputs, they are returned as members of a
struct, and the `getAsmOperandType` needs to be called for each member
of struct. The difference between this and the single-output case is
that in the latter, there isn't a struct wrapping the outputs.

I noticed this when trying to use the same mechanism in the RISC-V
backend.

Committing two tests:
- One that shows a crash before this change, which is fixed by this
change.
- One (commented out) that shows a different crash with tied
inputs/outputs. This is commented as it is not fixed by this change and
needs more work in target-independent inline asm handling code.

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