[llvm] [llvm][llvm-objdump] Fix fatbin handling on 32-bit systems (PR #141620)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Still running the rest of the tests locally to confirm.

Also wondering if this was using 64 bit types because you expect files greater than 4GB. In which case we can keep it as it was but add a check for StringRef::npos before we do any conversions.

https://github.com/llvm/llvm-project/pull/141620