[AArch64] Remove unnecessary casts (NFC) (#148339)

getInstrInfo() already returns const AArch64InstrInfo *.

Author: kazutakahirata

llvm/lib/Target/AArch64/AArch64FalkorHWPFFix.cpp

@@ -812,7 +812,7 @@ bool FalkorHWPFFix::runOnMachineFunction(MachineFunction &Fn) {
   if (skipFunction(Fn.getFunction()))
     return false;
 
-  TII = static_cast<const AArch64InstrInfo *>(ST.getInstrInfo());
+  TII = ST.getInstrInfo();
   TRI = ST.getRegisterInfo();
 
   MachineLoopInfo &LI = getAnalysis<MachineLoopInfoWrapperPass>().getLI();

llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp

@@ -3078,7 +3078,7 @@ bool AArch64LoadStoreOpt::runOnMachineFunction(MachineFunction &Fn) {
     return false;
 
   Subtarget = &Fn.getSubtarget<AArch64Subtarget>();
-  TII = static_cast<const AArch64InstrInfo *>(Subtarget->getInstrInfo());
+  TII = Subtarget->getInstrInfo();
   TRI = Subtarget->getRegisterInfo();
   AA = &getAnalysis<AAResultsWrapperPass>().getAAResults();
 

llvm/lib/Target/AArch64/AArch64StorePairSuppress.cpp

@@ -133,7 +133,7 @@ bool AArch64StorePairSuppress::runOnMachineFunction(MachineFunction &MF) {
   if (!ST.enableStorePairSuppress())
     return false;
 
-  TII = static_cast<const AArch64InstrInfo *>(ST.getInstrInfo());
+  TII = ST.getInstrInfo();
   TRI = ST.getRegisterInfo();
   MRI = &MF.getRegInfo();
   SchedModel.init(&ST);