[llvm] [Draft] Support save/restore point splitting in shrink-wrap (PR #119359)

[Elizaveta Noskova via llvm-commits]

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+# RUN: llc -march=riscv64 -run-pass shrink-wrap -enable-shrink-wrap-into-multiple-points=true  %s -o - | FileCheck  %s
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enoskova-sc wrote:

Actually, I don't know how to force update_mir_test_checks.py to add checks on Machine IR "metadata", like savePoint list. Maybe you know?

https://github.com/llvm/llvm-project/pull/119359