[AMDGPU][AsmParser][NFC] Remove an unused function.

[kosarev]

Summary

Was added in https://reviews.llvm.org/D63293, but never used.

[foad]

You don't really need pre-commit review for something this simple in code that you are familiar with.

llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp

public:
   }
 
   void addKImmFP32Operands(MCInst &Inst, unsigned N) const {
     addKImmFPOperands<32>(Inst, N);
   }
 
   void addRegOperands(MCInst &Inst, unsigned N) const;
 
-  void addBoolRegOperands(MCInst &Inst, unsigned N) const {
-    addRegOperands(Inst, N);
-  }
-
   void addRegOrImmOperands(MCInst &Inst, unsigned N) const {
     if (isRegKind())
       addRegOperands(Inst, N);
     else
       addImmOperands(Inst, N);
   }
 
   void addRegOrImmWithInputModsOperands(MCInst &Inst, unsigned N) const {