[llvm] [TableGen][InstrInfoEmitter] Count sub-operands on def operands (PR #88837)

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darkbuck wrote:

> Overall the changes looks okay to me, but a little question; why doesn't it also affect the normal store instructions?

These STORE-like instructions have the wrong operand info for their memory operands, which should be 'use' instead of 'def'. I found that during the debugging of this change.

https://github.com/llvm/llvm-project/pull/88837