[llvm-objcopy] [llvm-symbolizer] Fix failing tests

Summary: Fix failing tests that matched substrings in path.

Reviewers: evgeny777, mattd, espindola, alexshap, rupprecht, jhenderson

Reviewed By: jhenderson

Subscribers: Bulletmagnet, emaste, arichardson, jakehehrlich, MaskRay, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60170

llvm-svn: 357709