Revert "Add a warning if someone attempts to add extra section flags to sections"

There are a bunch of edge cases and inconsistencies in how we're emitting sections
cause this warning to fire and it needs more work.

This reverts commit r335558.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338968 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed