swift

b11b60e6 - SIL: add new instructions to support tail-allocated arrays in SIL.

SIL: add new instructions to support tail-allocated arrays in SIL. The new instructions are: ref_tail_addr, tail_addr and a new attribute [ tail_elems ] for alloc_ref. For details see docs/SIL.rst As these new instructions are not generated so far, this is a NFC.