[llvm] [CodeGen] [LIT] Pre-commit tests added for Early Program return optimization (PR #102128)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> As for the title, addresses the issue. In reference of #102127 , the issue supposedly would not show up in the pipeline, as it would be handled already in MachineBlockPlacement pass?

I still want to see *IR* tests. MIR tests are useful for testing mechanics and hard to reproduce edge cases, but the point of the change is an optimization. Optimization tests require the cooperation of the full pass pipeline to show they meaningfully work 

https://github.com/llvm/llvm-project/pull/102128