[llvm] [AMDGPU][SIOptimizeVGPRLiveRange] Add setpreservesCFG in the legacy pass flow. (PR #118256)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Christudasan Devadasan (cdevadas)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/118256.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp b/llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp
index e0ba5fa06f37a2..ff0b9b4a7574bf 100644
--- a/llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp
+++ b/llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp
@@ -155,6 +155,7 @@ class SIOptimizeVGPRLiveRangeLegacy : public MachineFunctionPass {
   }
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.setPreservesCFG();
     AU.addRequired<LiveVariablesWrapperPass>();
     AU.addRequired<MachineDominatorTreeWrapperPass>();
     AU.addRequired<MachineLoopInfoWrapperPass>();

``````````

</details>


https://github.com/llvm/llvm-project/pull/118256