[Testsuite] Renumber metadata in ScopedNoAliasAA test to match CHECK lines

Summary:
Now it's much easier to follow what's happening in this test.

Also removed some unused metadata entries.

Reviewers: hfinkel

Reviewed By: hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9601

llvm-svn: 236981