[llvm-cov] Disable PGO name compression in a test file

Some bots do not configure llvm with zlib enabled. Should fix:

http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast/builds/15571

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274137 91177308-0d34-0410-b5e6-96231b3b80d8

Author: vedantk