swift234

stop emitting initialize_var instructions in enum constructors.  This is
all we need to enable DI for enum constructors.  Structs and classes are
more complex, and the diagnostic produced is not great.  This resolves 
rdar://14922277.

Also, now an unreachable code diagnostic (with no source location) is 
produced when building the stdlib.  I'll investigate.


Swift SVN r10725