[llvm] [MC][AsmParser]: Don't use SourceMgr::AddIncludeFile when opening .incbin files (PR #194254)

[Alexis Engelke via llvm-commits]

aengelke wrote:

https://llvm.org/docs/CodeReview.html#code-reviews-speed-and-reciprocity

> If it is not urgent, the common courtesy ping rate is one week. Remember that you’re asking for valuable time from other professional developers.

I will look at this once I have the time. Note that I'm doing this in my spare time and am not paid to work on LLVM...

https://github.com/llvm/llvm-project/pull/194254