[clang] [llvm] [MC] Drop MCTargetOptions parameter from MCTargetAsmParser (PR #194120)

[Fangrui Song via cfe-commits]

MaskRay wrote:

llvm-mca passes a temporary `MCTargetOptions()`, which is incorrect but probably doesn't matter in practice. This change should fix it, therefore dropping `. NFC` from the title.

https://github.com/llvm/llvm-project/pull/194120