[llvm] [AMDGPU]: Unpack packed instructions overlapped by MFMAs post-RA scheduling (PR #157968)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,1173 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
----------------
arsenm wrote:

Can you add an end to end IR test for this? This also doesn't look like it comprehensively tests all the opcodes 

https://github.com/llvm/llvm-project/pull/157968