AMDGPU: fix mismatch tags, NFC

llvm-svn: 280006
diff --git a/llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h b/llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
index 61b38c8..f1cc534 100644
--- a/llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
+++ b/llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
@@ -27,7 +27,7 @@
 /// tells the hardware which interpolation parameters to load.
 class SIMachineFunctionInfo final : public AMDGPUMachineFunction {
   // FIXME: This should be removed and getPreloadedValue moved here.
-  friend struct SIRegisterInfo;
+  friend class SIRegisterInfo;
 
   unsigned TIDReg;