[llvm] [objdump] Fix dxcontainer tests on big endian host (PR #163427)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

Looks like this might have broken little endian systems...

The premerge checks failed on the PR before landing as well. Are you able to quickly fix forward or revert?

https://github.com/llvm/llvm-project/pull/163427