Add a symlink called lld-link to the clang package.

We now bundle lld on linux for linux builds.  Add this symlink to make it
easier to use it for cross builds too.

BUG=495204

Review-Url: https://codereview.chromium.org/2948413002
Cr-Commit-Position: refs/heads/master@{#481934}

tools/clang/scripts/package.py

@@ -318,6 +318,7 @@ def main():
 
   if sys.platform.startswith('linux'):
     os.symlink('lld', os.path.join(pdir, 'bin', 'ld.lld'))
+    os.symlink('lld', os.path.join(pdir, 'bin', 'lld-link'))
 
   # Copy libc++ headers.
   if sys.platform == 'darwin':