[llvm] [WinEH] Track changes in WinEHPrepare pass (PR #134121)

[Heejin Ahn via llvm-commits]

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@@ -1137,6 +1151,8 @@ void WinEHPrepareImpl::removeImplausibleInstructions(Function &F) {
                          CB->isInlineAsm()))
           continue;
 
+        Changed = true;
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aheejin wrote:

Is this true when `if (isa<InvokeInst>(CB))` is not satisfied?

https://github.com/llvm/llvm-project/pull/134121