AMDGPU/SI: Fix warning introduced by r255204

llvm-svn: 255205
diff --git a/llvm/lib/Target/AMDGPU/MCTargetDesc/SIMCCodeEmitter.cpp b/llvm/lib/Target/AMDGPU/MCTargetDesc/SIMCCodeEmitter.cpp
index d316358..9eb3dad 100644
--- a/llvm/lib/Target/AMDGPU/MCTargetDesc/SIMCCodeEmitter.cpp
+++ b/llvm/lib/Target/AMDGPU/MCTargetDesc/SIMCCodeEmitter.cpp
@@ -36,7 +36,6 @@
   void operator=(const SIMCCodeEmitter &) = delete;
   const MCInstrInfo &MCII;
   const MCRegisterInfo &MRI;
-  MCContext &Ctx;
 
   /// \brief Can this operand also contain immediate values?
   bool isSrcOperand(const MCInstrDesc &Desc, unsigned OpNo) const;
@@ -47,7 +46,7 @@
 public:
   SIMCCodeEmitter(const MCInstrInfo &mcii, const MCRegisterInfo &mri,
                   MCContext &ctx)
-    : MCII(mcii), MRI(mri), Ctx(ctx) { }
+    : MCII(mcii), MRI(mri) { }
 
   ~SIMCCodeEmitter() override {}