Fix gcc Wparentheses warning. NFC.

Author: RKSimon

llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp

@@ -1706,9 +1706,8 @@ OperandMatcher &
 InstructionMatcher::addOperand(unsigned OpIdx, const std::string &SymbolicName,
                                unsigned AllocatedTemporariesBaseID,
                                bool IsVariadic) {
-  assert(Operands.empty() ||
-         !Operands.back()->isVariadic() &&
-             "Cannot add more operands after a variadic operand");
+  assert((Operands.empty() || !Operands.back()->isVariadic()) &&
+         "Cannot add more operands after a variadic operand");
   Operands.emplace_back(new OperandMatcher(
       *this, OpIdx, SymbolicName, AllocatedTemporariesBaseID, IsVariadic));
   if (!SymbolicName.empty())