ELF: Add --help option.

llvm-svn: 262168
diff --git a/lld/ELF/DriverUtils.cpp b/lld/ELF/DriverUtils.cpp
index cf7e7dd..a662b3c 100644
--- a/lld/ELF/DriverUtils.cpp
+++ b/lld/ELF/DriverUtils.cpp
@@ -79,6 +79,11 @@
   return Args;
 }
 
+void elf::printHelp(const char *Argv0) {
+  ELFOptTable Table;
+  Table.PrintHelp(outs(), Argv0, "lld", false);
+}
+
 void elf::printVersion() {
   outs() << "LLD " << getLLDVersion();
   std::string S = getLLDRepositoryVersion();