[llvm] [llvm-debuginfo-analyzer] Add support for LLVM IR format. (PR #135440)

[Javier Lopez-Gomez via llvm-commits]

================

----------------
jalopezg-git wrote:

Related to a [previous comment](https://github.com/llvm/llvm-project/pull/135440#discussion_r3163476944): If the `llvm::dyn_cast<MemoryBufferRef>(&Buffer)` always succeeds, it probably can be changed to `llvm::cast` instead.

https://github.com/llvm/llvm-project/pull/135440