FIX: Remove unused private data member HasWholeProgramVisibility in AMDGPU.h

Author: shiltian

llvm/lib/Target/AMDGPU/AMDGPU.h

@@ -293,9 +293,6 @@ class AMDGPUAttributorPass : public PassInfoMixin<AMDGPUAttributorPass> {
 
   AMDGPUAttributorOptions Options;
 
-  /// Asserts whether we can assume whole program visibility.
-  bool HasWholeProgramVisibility = false;
-
 public:
   AMDGPUAttributorPass(TargetMachine &TM, AMDGPUAttributorOptions Options = {})
       : TM(TM), Options(Options) {};