swift234

SIL Parser: parse copy_addr and upcast_existential.

Modify SILPrinter to print necessary types for parsing.
Format of copy_addr is changed from
  copy_addr Src [take]? to Dst [initialization]?
  to
  copy_addr [take]? Src to [initialization]? Dst : DstType
to put the attribute in front of the actual value.
It also makes parsing easier since '[' can start an array type.


Swift SVN r6268