Copy clang/Driver/<Option parsing stuff> to llvm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169344 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/TableGen.cpp

@@ -40,7 +40,8 @@ enum ActionType {
   GenTgtIntrinsic,
   GenEDInfo,
   PrintEnums,
-  PrintSets
+  PrintSets,
+  GenOptParserDefs
 };
 
 namespace {
@@ -82,6 +83,8 @@ namespace {
                                "Print enum values for a class"),
                     clEnumValN(PrintSets, "print-sets",
                                "Print expanded sets for testing DAG exprs"),
+                    clEnumValN(GenOptParserDefs, "gen-opt-parser-defs",
+                               "Generate option definitions"),
                     clEnumValEnd));
 
   cl::opt<std::string>
@@ -138,6 +141,9 @@ bool LLVMTableGenMain(raw_ostream &OS, RecordKeeper &Records) {
   case GenEDInfo:
     EmitEnhancedDisassemblerInfo(Records, OS);
     break;
+  case GenOptParserDefs:
+    EmitOptParser(Records, OS);
+    break;
   case PrintEnums:
   {
     std::vector<Record*> Recs = Records.getAllDerivedDefinitions(Class);