[llvm] [MachinePipeliner] Give up machine pipeliner when the loop body is re… (PR #98292)

[Yuta Mukai via llvm-commits]

ytmukai wrote:

Thanks for the fix! I have also posted a similar patch(#80840). The maximum number of instructions is different; I think setting it to 200 would prevent a larger percentage of the execution time for this pass. Also, it would not decrease the number of loops that can be pipelined because the maximum value of MinII, which is 27, is a stricter constraint.

https://github.com/llvm/llvm-project/pull/98292