Add ability to update existing variables with values read from the command line

to certain classes.  This is nice because it means that in header files we can
just declare a value, and still have that value be set based on a command-line
argument.  The difference is now that the #include of CommandLine.h does not
need to go into the header file as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2708 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/CommandLine.cpp

@@ -346,7 +346,7 @@ bool EnumValueBase::handleOccurance(const char *ArgName, const string &Arg) {
     return error(": unrecognized alternative '" + Arg +
                  "'!  Alternatives are: " + Alternatives);
   }
-  Value = ValueMap[i].second.first;
+  setValue(ValueMap[i].second.first);
   return false;
 }