[llvm] [Hexagon][llvm-objdump] Fix crash at a truncated instruction (PR #142082)

[Brian Cain via llvm-commits]

androm3da wrote:

`LLVM :: tools/llvm-dwarfdump/X86/debug_info_crel.yaml` -- this failure, is it on the baseline?  Or could it be related to this change?

https://github.com/llvm/llvm-project/pull/142082