[CMake] Introduce LIT in add_lit_target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197682 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-config: Show build root instead of parent path in build tree with --obj-root for CMake multiconfig.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197683 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-config: Don't show build tree with --obj-root for installed llvm-config. Show $(prefix) instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197684 91177308-0d34-0410-b5e6-96231b3b80d8
Support for microMIPS TLS relocations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197685 91177308-0d34-0410-b5e6-96231b3b80d8