[test] Move llvm-lib tests into tools/llvm-lib. NFC.

Similarly to SVN r317189 for llvm-dlltool, these are probably
easier to find in a tools subdirectory with a name identical to
the tool, than in a toplevel directory with a different name.

This matches the move of LibDriver itself in SVN r302995.

Differential Revision: https://reviews.llvm.org/D39531



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317262 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed