clang should share llvm's dist_subdir

[ryandesign (Ryan Carsten Schmidt)]

clang uses llvm's distfile, so it would be best to share llvm's dist_subdir so that users don't have to download the llvm distfile twice -- once for the llvm port and once for the clang port. This would also help our mirror servers not need to mirror the llvm distfile twice (in the future; the damage is already done for version 2.9).

This would be accomplished by adding this line to the clang portfile:

dist_subdir llvm

You can either do it now (which would cause the distfiles mirrors to download and mirror a second copy of the clang 2.9 distfile), or you can wait until you update the portfiles to the next version of llvm / clang.

[jeremyhu (Jeremy Huddleston Sequoia)]

r91154 r91155