AMDGPU/NewPM: Initialize class member

After #102654

Author: vitalybuka

llvm/lib/Target/AMDGPU/AMDGPUAnnotateUniformValues.cpp

@@ -33,7 +33,7 @@ class AMDGPUAnnotateUniformValues
   MemorySSA *MSSA;
   AliasAnalysis *AA;
   bool isEntryFunc;
-  bool Changed;
+  bool Changed = false;
 
   void setUniformMetadata(Instruction *I) {
     I->setMetadata("amdgpu.uniform", MDNode::get(I->getContext(), {}));