[TableGen] Address Haohai's comments

Author: Yuanke Luo

llvm/test/TableGen/DFAPacketizer.td

@@ -31,6 +31,7 @@ def Itin {
 // CHECK-NEXT:       std::begin(TestTargetProcIdToProcResourceIdxTable),
 // CHECK-NEXT:       std::end(TestTargetProcIdToProcResourceIdxTable), ProcID,
 // CHECK-NEXT:       [](const unsigned LHS[], unsigned Val) { return LHS[0] < Val; });
+// CHECK-NEXT:   assert(*It[0] == ProcID);
 // CHECK-NEXT:   return (*It)[1];
 // CHECK-NEXT: }
 

llvm/utils/TableGen/DFAPacketizerEmitter.cpp

@@ -284,6 +284,7 @@ void DFAPacketizerEmitter::emitForItineraries(
      << "ProcIdToProcResourceIdxTable), ProcID,\n"
      << "      [](const unsigned LHS[], unsigned Val) { return LHS[0] < Val; "
         "});\n"
+     << "  assert(*It[0] == ProcID);\n"
      << "  return (*It)[1];\n"
      << "}\n\n";