[ELF] Don't check if symbols in .llvm.call-graph-profile are unorderable

Summary: There are too many reasonable cases that would be considered unorderable.

Reviewers: ruiu, espindola, Bigcheese

Reviewed By: ruiu

Subscribers: grimar, emaste, arichardson, llvm-commits

Differential Revision: https://reviews.llvm.org/D53669

llvm-svn: 345322