[llvm] [X86] Reuse AND flags for redundant TEST with known SF (PR #202918)

[Phoebe Wang via llvm-commits]

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@@ -619,3 +836,68 @@ body:             |
     RET 0, $ax
 
 ...
+
+# CHECK-LABEL: name: erase_test8_sf
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phoebewang wrote:

CHECKs should accompany with the input function. Did you update it with update_mir_test_checks.py?

https://github.com/llvm/llvm-project/pull/202918