[llvm] Drop "const" from "const StringRef" (NFC) (llvm#138821)

Author: kazutakahirata

llvm/include/llvm/Analysis/DXILResource.h

@@ -375,7 +375,7 @@ class ResourceInfo {
 
   const ResourceBinding &getBinding() const { return Binding; }
   TargetExtType *getHandleTy() const { return HandleTy; }
-  const StringRef getName() const { return Symbol ? Symbol->getName() : ""; }
+  StringRef getName() const { return Symbol ? Symbol->getName() : ""; }
 
   bool hasSymbol() const { return Symbol; }
   GlobalVariable *createSymbol(Module &M, StructType *Ty, StringRef Name = "");

llvm/lib/Target/ARM/MCTargetDesc/ARMAddressingModes.h

@@ -41,7 +41,7 @@ namespace ARM_AM {
 
   inline const char *getAddrOpcStr(AddrOpc Op) { return Op == sub ? "-" : ""; }
 
-  inline const StringRef getShiftOpcStr(ShiftOpc Op) {
+  inline StringRef getShiftOpcStr(ShiftOpc Op) {
     switch (Op) {
     default: llvm_unreachable("Unknown shift opc!");
     case ARM_AM::asr: return "asr";