[llvm] delete MF.verify from PPCMIPeephole pass (PR #108075)

[Nemanja Ivanovic via llvm-commits]

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@@ -177,11 +177,6 @@ struct PPCMIPeephole : public MachineFunctionPass {
     if (skipFunction(MF.getFunction()))
       return false;
     bool Changed = simplifyCode();
-#ifndef NDEBUG
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nemanjai wrote:

The verifier definitely has some super linear behavior. We’ve encountered this before. It is unfortunate that it is triggered here. I definitely agree with switching to expensive checks rather than disabling it altogether. 

https://github.com/llvm/llvm-project/pull/108075