[MachineInstr] Don't include debug uses in bundle header (PR52817)

Following the recommendation in
https://github.com/llvm/llvm-project/issues/52817#issuecomment-1007635426,
this excludes debug instructions when finalizing the bundle. As uses
in debug instructions don't have effects, they will no longer be
included in the BUNDLE header.

Fixes https://github.com/llvm/llvm-project/issues/52817.

Differential Revision: https://reviews.llvm.org/D116945