[llvm] [X86][CodeGen] Support flags copy lowering for CCMP/CTEST (PR #91849)

[Shengchen Kan via llvm-commits]

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@@ -970,3 +977,29 @@ void X86FlagsCopyLoweringPass::rewriteSetCC(MachineBasicBlock &TestMBB,
 
   SetCCI.eraseFromParent();
 }
+
+void X86FlagsCopyLoweringPass::rewriteCCMP(MachineBasicBlock &TestMBB,
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KanRobert wrote:

Most of the `rewrite*` functions can be merged together, including `rewriteCMov`. I will do it after this PR.

https://github.com/llvm/llvm-project/pull/91849