Option parsing: support case-insensitive option matching.

Link.exe's command line options are case-insensitive. This patch
adds a new attribute to OptTable to let the option parser to compare
options, ignoring case.

Command lines are generally case-insensitive on Windows. CL.exe is an
exception. So this new attribute should be useful for other commands
running on Windows.

Differential Revision: http://llvm-reviews.chandlerc.com/D1485

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189416 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Option/OptTable.h

@@ -51,6 +51,7 @@ private:
   /// \brief The static option information table.
   const Info *OptionInfos;
   unsigned NumOptionInfos;
+  bool IgnoreCase;
 
   unsigned TheInputOptionID;
   unsigned TheUnknownOptionID;
@@ -72,7 +73,8 @@ private:
   }
 
 protected:
-  OptTable(const Info *_OptionInfos, unsigned _NumOptionInfos);
+  OptTable(const Info *_OptionInfos, unsigned _NumOptionInfos,
+           bool _IgnoreCase = false);
 public:
   ~OptTable();