Add PrintVersionMessage() that tools can use to print version number

without exiting program.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33737 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/CommandLine.h

@@ -1281,6 +1281,7 @@ struct extrahelp {
   extrahelp(const char* help);
 };
 
+void PrintVersionMessage();
 // This function just prints the help message, exactly the same way as if the
 // --help option had been given on the command line.
 // NOTE: THIS FUNCTION TERMINATES THE PROGRAM!