Revert BTF commit series.

The initial patch was not reviewed, and does not have any tests;
it should not have been merged.

This reverts 344395, 344390, 344387, 344385, 344381, 344376,
and 344366.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344405 91177308-0d34-0410-b5e6-96231b3b80d8
18 files changed