swift234

Devirtual ApplyInst + project_existential.

This optimization devirtualizes a very common pattern:

%0 = alloc ... $aProtocol
%1 = init_existential %0#1 : $*aProtocol, $*Foo  <-- Foo is the static type!
%4 = project_existential %0#1
%5 = protocol_method %0#1 : $*aProtocol, #aProtocol.aMethod!1 :
%8 = apply %5( .. args ... , %4) :

rdar://15466450.



Swift SVN r11893