[llvm] [MachineSink][AArch64] Preserve debug location when rematerialising an instruction to replace a COPY (PR #72685)

[antoine moynault via llvm-commits]

https://github.com/antmox approved this pull request.

LGTM. Successfully tested locally.
Also tested with aarch64-enable-sink-fold enabled by default again. Bot lldb-aarch64-ubuntu should be OK.
Also, note that Linaro's CI found several code size regressions on AOSP due to the revert of your initial patch #72132.

https://github.com/llvm/llvm-project/pull/72685