[AMDGPU] Declare TableRef in terms of ArrayRef (NFC)

Author: kazutakahirata

llvm/lib/Target/AMDGPU/AMDGPULibCalls.cpp

@@ -376,15 +376,7 @@ static bool HasNative(AMDGPULibFunc::EFuncId id) {
   return false;
 }
 
-struct TableRef {
-  size_t size;
-  const TableEntry *table; // variable size: from 0 to (size - 1)
-
-  TableRef() : size(0), table(nullptr) {}
-
-  template <size_t N>
-  TableRef(const TableEntry (&tbl)[N]) : size(N), table(&tbl[0]) {}
-};
+using TableRef = ArrayRef<TableEntry>;
 
 static TableRef getOptTable(AMDGPULibFunc::EFuncId id) {
   switch(id) {
@@ -698,11 +690,11 @@ bool AMDGPULibCalls::fold(CallInst *CI, AliasAnalysis *AA) {
 bool AMDGPULibCalls::TDOFold(CallInst *CI, const FuncInfo &FInfo) {
   // Table-Driven optimization
   const TableRef tr = getOptTable(FInfo.getId());
-  if (tr.size==0)
+  if (tr.empty())
     return false;
 
-  int const sz = (int)tr.size;
-  const TableEntry * const ftbl = tr.table;
+  int const sz = (int)tr.size();
+  const TableEntry * const ftbl = tr.data();
   Value *opr0 = CI->getArgOperand(0);
 
   if (getVecSize(FInfo) > 1) {