[analyzer] Restructure a test file

Summary:
I've had a test failure here while experimenting and I've found that it's
impossible to find what is wrong with the previous structure of the file. So I
have grouped the expected output with the function that produces it, to make
searching for discrepancies more obvious.

Reviewers: jordan_rose

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1595