swift234

Remove the old "getExistentialOrArchetypeRValueAddress" hack for producing some
bases at +0, and use the new SGFContext::AllowPlusZero mechanism instead.  It
is more rigorous and general.  This cuts 34 lines out of the stdlib, deleting
temporary materializations from: Zip2.generate, and several methods from
Reverse and ReverseIndex.

Also:
 SILGenApply.cpp |   41 ++++-------------------------------------
 1 file changed, 4 insertions(+), 37 deletions(-)



Swift SVN r12875