[llvm] [RISCV][llvm-mca] Add llvm-mca tests for SiFive7 Vector Integer Arith… (PR #65283)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

> The tests are failed.

I have updated the CHECK statements in the test case. I had run the update_mca_test_checks script before rebasing which led to the failure.

https://github.com/llvm/llvm-project/pull/65283