[llvm] [llvm][CodeGen] Fix the issue caused by live interval checking in window scheduler (PR #123184)

[Hua Tian via llvm-commits]

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@@ -271,7 +271,7 @@ void WindowScheduler::backupMBB() {
   // Remove MIs and the corresponding live intervals.
   for (auto &MI : make_early_inc_range(*MBB)) {
     Context->LIS->RemoveMachineInstrFromMaps(MI);
-    MBB->remove(&MI);
+    MI.removeFromParent();
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huaatian wrote:

This MI is copied to OriMIs and will be used later during cloning and restoration. I will submit a new NFC later.

https://github.com/llvm/llvm-project/pull/123184