casa-mp-base

llvm*: Update to 3.8.1 and do various updates to *select that require revbumping all llvm ports

Update llvm-3.8 to use release tarballs (https://trac.macports.org/ticket/50847), mostly 3.8.1.
Remove macho-dump from llvm-3.8's select list (https://trac.macports.org/ticket/51541).
Work around a bug in Snow Leopard's dyld (https://trac.macports.org/ticket/51542).
Update clang and llvm select options (https://trac.macports.org/ticket/47631, https://trac.macports.org/ticket/49844).

git-svn-id: https://svn.macports.org/repository/macports/trunk/dports@150287 d073be05-634f-4543-b044-5fe20cf6d1d6