Revert "llvm-mt: implement simple merging of manifests, not factoring namespaces."

This reverts commit 813308e240792ca70ed2f998f21df24a5061ada0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309050 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed