Fix ABC elimination.
Merge branch 'master' into v2.1
Merge branch 'v2.1' of http://luajit.org/git/luajit-2.0
FFI: Fix compilation of reference field access.
Merge branch 'master' into v2.1
Invalidate backpropagation cache after DCE.
Merge branch 'master' into v2.1
Merge branch 'v2.1' of http://luajit.org/git/luajit-2.0