Revert r301986 (and subsequent r301987).

Revert r301986 (and subsequent r301987).

The patch is failing to add StringTableStreamBuilder.h, but that isn't
even discovered because the corresponding StringTableStreamBuilder.cpp
isn't added to any CMakeLists.txt file and thus never built. I think
this patch is just incomplete.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302002 91177308-0d34-0410-b5e6-96231b3b80d8