Revert "Add the ability to segment GSYM files."

This reverts commit fe758254.

This change was causing several buildbot failures:
- https://lab.llvm.org/buildbot/#/builders/38/builds/10105
- https://lab.llvm.org/buildbot/#/builders/192/builds/562
- https://lab.llvm.org/buildbot/#/builders/109/builds/58893
- https://lab.llvm.org/buildbot/#/builders/16/builds/44360
- https://lab.llvm.org/buildbot/#/builders/247/builds/2095
- https://lab.llvm.org/buildbot/#/builders/196/builds/27236
- https://lab.llvm.org/buildbot/#/builders/54/builds/3714