[Xtensa] Fix Clang warnings after #92960

Author: MaskRay

llvm/lib/Target/Xtensa/XtensaFrameLowering.cpp

@@ -25,7 +25,7 @@ using namespace llvm;
 XtensaFrameLowering::XtensaFrameLowering(const XtensaSubtarget &STI)
     : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(4), 0,
                           Align(4)),
-      STI(STI), TII(*STI.getInstrInfo()), TRI(STI.getRegisterInfo()) {}
+      TII(*STI.getInstrInfo()), TRI(STI.getRegisterInfo()) {}
 
 bool XtensaFrameLowering::hasFP(const MachineFunction &MF) const {
   const MachineFrameInfo &MFI = MF.getFrameInfo();

llvm/lib/Target/Xtensa/XtensaFrameLowering.h

@@ -18,7 +18,6 @@ class XtensaInstrInfo;
 class XtensaRegisterInfo;
 
 class XtensaFrameLowering : public TargetFrameLowering {
-  const XtensaSubtarget &STI;
   const XtensaInstrInfo &TII;
   const XtensaRegisterInfo *TRI;
 

llvm/lib/Target/Xtensa/XtensaRegisterInfo.h

@@ -24,7 +24,7 @@ class TargetRegisterClass;
 class XtensaInstrInfo;
 class XtensaSubtarget;
 
-struct XtensaRegisterInfo : public XtensaGenRegisterInfo {
+class XtensaRegisterInfo : public XtensaGenRegisterInfo {
 public:
   const XtensaSubtarget &Subtarget;