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

[Aaron Puchert 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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aaronpuchert wrote:

We still execute `changeToUnreachable(&I)` in that case (see the `else` branch), and that seems to change something.

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