[llvm] [CodeGen] Treat Reg uses which are partially defined within bundle as internal read (PR #201004)

[Jay Foad via llvm-commits]

jayfoad wrote:

Do you have a reduced IR test that would fail without this patch (with -verify-machineinstrs or with LLVM_ENABLE_EXPENSIVE_CHECKS)?

https://github.com/llvm/llvm-project/pull/201004