Fix dependencies now that the ARC migrator depends on the static analyzer.

Fix dependencies now that the ARC migrator depends on the static analyzer.

Thanks for pointing this out, Stephen. I think this is right now -- I
attempted to try all four valid combinations with both the autoconf and
CMake builds.

See also LLVM changes to the configure script.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189027 91177308-0d34-0410-b5e6-96231b3b80d8