swift234

When we devirtualize apply instructions that access protocols we look for the
init_existential instruction. However, in some cases the protocol is initialized
using copy_addr. This patch adds support for analyzing the copy_addr in search
for the init_existential instruction. The same rules must apply: both
instructions must not be captured, etc.

With this change we devirtualize 287 calls in stdlib. We are left with only 26 project_existential instructions in stdlib.
I don't have a testcase outside the stdlib right now.



Swift SVN r11897