Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/Transforms/LICM/alias-set-tracker-loss.ll

@@ -0,0 +1,39 @@
+; RUN: opt -S -licm -loop-unroll < %s
+;
+; This test contains a carefully rotated set of three nested loops. The middle
+; loop can be unrolled leaving one copy of the inner loop inside the outer
+; loop. Because of how LICM works, when this middle loop is unrolled and
+; removed, its alias set tracker is destroyed and no longer available when LICM
+; runs on the outer loop.
+
+define void @f() {
+entry:
+  br label %l1
+
+l2.l1.loopexit_crit_edge:
+  br label %l1.loopexit
+
+l1.loopexit:
+  br label %l1.backedge
+
+l1:
+  br i1 undef, label %l1.backedge, label %l2.preheader
+
+l1.backedge:
+  br label %l1
+
+l2.preheader:
+  br i1 true, label %l1.loopexit, label %l3.preheader.lr.ph
+
+l3.preheader.lr.ph:
+  br label %l3.preheader
+
+l2.loopexit:
+  br i1 true, label %l2.l1.loopexit_crit_edge, label %l3.preheader
+
+l3.preheader:
+  br label %l3
+
+l3:
+  br i1 true, label %l3, label %l2.loopexit
+}