[TableGen] Add an explicit cast to allow one TypeSetByHwMode constructor to be removed. NFC

This constructor was taking a ValueTypeByMode by value to create
an ArrayRef. By adding an explicit cast from ValueTypeByHwMode
to TypeSetByHwMode we allow the ArrayRef to be implicitly converted
from a single element.

Author: topperc

llvm/utils/TableGen/Common/CodeGenDAGPatterns.h

@@ -193,8 +193,6 @@ struct TypeSetByHwMode : public InfoByHwMode<MachineValueTypeSet> {
   TypeSetByHwMode &operator=(const TypeSetByHwMode &) = default;
   TypeSetByHwMode(MVT::SimpleValueType VT)
       : TypeSetByHwMode(ValueTypeByHwMode(VT)) {}
-  TypeSetByHwMode(ValueTypeByHwMode VT)
-      : TypeSetByHwMode(ArrayRef<ValueTypeByHwMode>(&VT, 1)) {}
   TypeSetByHwMode(ArrayRef<ValueTypeByHwMode> VTList);
 
   SetType &getOrCreate(unsigned Mode) { return Map[Mode]; }

llvm/utils/TableGen/GlobalISelEmitter.cpp

@@ -1162,7 +1162,7 @@ Error GlobalISelEmitter::importChildMatcher(
       OperandMatcher &OM =
           InsnOperand.getInsnMatcher().addOperand(0, "", TempOpIdx);
       if (auto Error =
-              OM.addTypeCheckPredicate(VTy, false /* OperandIsAPointer */))
+              OM.addTypeCheckPredicate(TypeSetByHwMode(VTy), false /* OperandIsAPointer */))
         return failedImport(toString(std::move(Error)) +
                             " for result of Src pattern operator");