[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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@@ -0,0 +1,60 @@
+# REQUIRES: asserts
+# 
+# RUN: llc --mtriple=hexagon %s -run-pass=pipeliner -debug-only=pipeliner \
+# RUN: -filetype=null 2>&1 | FileCheck %s
+
+# The bug was reported at https://github.com/llvm/llvm-project/issues/123165.
+# It is caused by the corruption of live intervals in certain scenarios.
+#
+# We check window scheduling logs to ensure that there is no crashing.
+# CHECK: Start analyzing II:
+# CHECK: MaxCycle is {{[0-9]+}}.
+# CHECK: MaxStallCycle is {{[0-9]+}}.
+# CHECK: Start scheduling Phis:
+# CHECK: Current window Offset is {{[0-9]+}} and II is {{[0-9]+}}.
+# CHECK: Window scheduling is not needed!
+
+...
+---
+name:            _ZN10CInArchive17GetNextFolderItemEv
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huaatian wrote:

Updated

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