[llvm] [LoopFusion] Forget loop and block dispositions after latch merge (PR #166233)

[via llvm-commits]

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@@ -0,0 +1,65 @@
+; REQUIRES: asserts
+; RUN: opt -passes=loop-fusion -disable-output -stats < %s 2>&1 | FileCheck -check-prefix=STAT %s
+; STAT: 1 loop-fusion - Loops fused
+
+; C Code
+;
+;;  for (int i = 0; i < 100; ++i)
+;;      Array[i][i] = -i;
+;;  for (int row = 0; row < 100; ++row)
+;;      for (int col = 0; col < 100; ++col)
+;;          if (col != row)
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CongzheUalberta wrote:

if you get rid of the `if (col!=row)` condition, the two loops should still be legal to fuse. In that case are you able to reproduce the crash? If yes then you can add it as another test.

https://github.com/llvm/llvm-project/pull/166233