Fix bug in -nostdlib.

We still have to skip a token inside SEARCH_DIR() when -nostdlib is
specified. Previuosly, we didn't skip it, so it caused a parse error.

llvm-svn: 281001
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index eeb6dc2..223218f 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -886,8 +886,9 @@
 
 void ScriptParser::readSearchDir() {
   expect("(");
+  StringRef Tok = next();
   if (!Config->Nostdlib)
-    Config->SearchPaths.push_back(next());
+    Config->SearchPaths.push_back(Tok);
   expect(")");
 }