ELF2: Remove ArgParser class and define parseArgs() function instead.

ArgParser was a class with only one member function, so it didn't
have to be a class.

llvm-svn: 249988
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index 8566deb..271ebde 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -112,7 +112,7 @@
 void LinkerDriver::main(ArrayRef<const char *> ArgsArr) {
   initSymbols();
 
-  opt::InputArgList Args = ArgParser(&Alloc).parse(ArgsArr);
+  opt::InputArgList Args = parseArgs(&Alloc, ArgsArr);
   createFiles(Args);
 
   switch (Config->ElfKind) {