[Target] Remove unnecessary casts (NFC) (#149342)

getFunction().getParent() already returns Module *.

Author: kazutakahirata

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

@@ -9308,7 +9308,7 @@ SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
     return DAG.getNode(AMDGPUISD::PERM, DL, MVT::i32, Op.getOperand(1),
                        Op.getOperand(2), Op.getOperand(3));
   case Intrinsic::amdgcn_reloc_constant: {
-    Module *M = const_cast<Module *>(MF.getFunction().getParent());
+    Module *M = MF.getFunction().getParent();
     const MDNode *Metadata = cast<MDNodeSDNode>(Op.getOperand(1))->getMD();
     auto SymbolName = cast<MDString>(Metadata->getOperand(0))->getString();
     auto *RelocSymbol = cast<GlobalVariable>(

llvm/lib/Target/ARM/ARMISelLowering.cpp

@@ -3545,8 +3545,7 @@ SDValue ARMTargetLowering::LowerConstantPool(SDValue Op,
     auto AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
     auto T = const_cast<Type*>(CP->getType());
     auto C = const_cast<Constant*>(CP->getConstVal());
-    auto M = const_cast<Module*>(DAG.getMachineFunction().
-                                 getFunction().getParent());
+    auto M = DAG.getMachineFunction().getFunction().getParent();
     auto GV = new GlobalVariable(
                     *M, T, /*isConstant=*/true, GlobalVariable::InternalLinkage, C,
                     Twine(DAG.getDataLayout().getPrivateGlobalPrefix()) + "CP" +