[llvm] [CodeGen] Fix InstructionCount remarks for MI bundles (PR #107621)

[Francis Visoiu Mistrih via llvm-commits]

francisvm wrote:

> This is probably by design. Code is supposed to logically treat a bundle as one instruction

Some targets use bundles to mark instruction packet boundaries, no? IMO, that shouldn't be counted as one instruction.

https://github.com/llvm/llvm-project/pull/107621