rustc: add zero_root upcall, use to keep roots alive long enough (and zero after)
core: fix bug in reflect visiting vec rather than unboxed vec.
core: add hex-writing helper to WriterUtil
core / rt: reserve / realloc managed-unique pointers through at_vec.
core: rewrite cleanup to contain a conservative GC (not active)
rustc: clean up unused imports
warning police
test: remove refcount-inspecting test
core: change trie::find_mut to actually test the key for equality
Add heapmap for (hopefully) denser tracking of allocations.
core: hook up local heap malloc/free/realloc to notify the conservative GC.
minor compile fixes to adapt to rebase
rustc: stop emitting refcount code, fail if anyone tries to explicitly free @ boxes.
fixes for windows and 32bit mode
Add graph writer for diagnostics.