Options: Add new option kind that consumes remaining arguments

This adds KIND_REMAINING_ARGS, a class of options that consume
all remaining arguments on the command line.

This will be used to support /link in clang-cl, which is used
to forward all remaining arguments to the linker.

It also allows us to remove the hard-coded handling of "--",
allowing clients (clang and lld) to implement that functionality
themselves with this new option class.

Differential Revision: http://llvm-reviews.chandlerc.com/D1387

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188314 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Option/OptParser.td

@@ -44,6 +44,8 @@ def KIND_JOINED_OR_SEPARATE : OptionKind<"JoinedOrSeparate">;
 // An option which is both joined to its (first) value, and followed by its
 // (second) value.
 def KIND_JOINED_AND_SEPARATE : OptionKind<"JoinedAndSeparate">;
+// An option which consumes all remaining arguments if there are any.
+def KIND_REMAINING_ARGS : OptionKind<"RemainingArgs">;
 
 // Define the option flags.
 

include/llvm/Option/Option.h

@@ -50,6 +50,7 @@ public:
     FlagClass,
     JoinedClass,
     SeparateClass,
+    RemainingArgsClass,
     CommaJoinedClass,
     MultiArgClass,
     JoinedOrSeparateClass,
@@ -149,6 +150,7 @@ public:
     case SeparateClass:
     case MultiArgClass:
     case JoinedOrSeparateClass:
+    case RemainingArgsClass:
       return RenderSeparateStyle;
     }
     llvm_unreachable("Unexpected kind!");