Fix LLVM sha1 and version number.

This updates the sha1 of the LLVM package (it was probably silently updated without bumping the version.) It also has a patch to fix the version and change it from `3.2svn` to `3.2`. This fixes #17034.

The bottles will need to be rebuilt, and I don't know who's responsible for that. I'm also of the opinion that the `llvm` should include `compiler-rt` - indeed, it's a very very useful addition to `clang` and it's highly recommended in general (clients can instrument IR for things like Address Sanitizer support.)

In general I think this should be closed out as fast as possible. I'm going to make a separate request for `compiler-rt` support, and I think both should be merged and the bottles rebuilt by someone.