the fn/closure pairs.

Disable native2.rs for now as we are not yet defining the wrappers and it
fails to link.

fn write(int fd, rustrt.vbuf buf, uint count) -> int;

compiles to

declare i32 @write(i32, i8*, i32)

and a rust

fn vec_buf[T](vec[T] v, uint offset) -> vbuf;

compiles to

declare i8* @vec_buf(%task*, %tydesc*, %"vec[<P0:2>]", i32)

which I think is the correct declaration for both :-)

rustc: Make the tag info table keyed by both tag ID and type parameter. Also fix a bug that was causing all tags to compare equal.

Add a tag_variant_count() function to trans that doesn't go through the soon-to-be-deprecated tag info table

Revert "rustc: Push type parameters down through alt tag patterns; add a test" due to valgrind failures

This reverts commit 7a1d01ef.

soon.).

rustc: Perform type parameter substitutions when emitting glue for generic tags. Un-XFAIL generic-tag.rs.

Support the awful alt-else form in rustboot's cexp grammar, at least transiently. Remove in the future.

Cast more aggressively to the callee type when calling generic functions. Add a test-case for this, and XFAIL it in rustboot.