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DO-NOT-MERGE: Lsra heuristic reordering #51626

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Dummy PR to run jitstressregs pipelines.

- Introduce register selection
- Moved all the heuristics in seperate methods
@kunalspathak kunalspathak added NO-MERGE The PR is not ready for merge yet (see discussion for detailed reasons) NO-REVIEW Experimental/testing PR, do NOT review it labels Apr 21, 2021
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Apr 21, 2021
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Failure related to #51542

- Gather `PerfScore` during compilation
- Print it out at the end of superpmi.exe run
- Let superpmi.py parse the numbers
- At the end of superpmi.py, skip running asmdiff, and instead just print the perfscore diff.
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This is merged in #52832

@ghost ghost locked as resolved and limited conversation to collaborators Jun 19, 2021
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area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI NO-MERGE The PR is not ready for merge yet (see discussion for detailed reasons) NO-REVIEW Experimental/testing PR, do NOT review it
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