Keep track of stores produced by exploded copy_addrs in the NonLoadUses

set.  This is the last fix required to get copy_addr to forward to the
load in this trivial example from rdar://15170149:

func testTrivial(a : @inout Int) -> Int {
  return a
}

on to more testing.



Swift SVN r9167

lib/SILPasses/DefiniteInitialization.cpp

@@ -941,6 +941,7 @@ void ElementPromotion::explodeCopyAddr(CopyAddrInst *CAI,
 
     case ValueKind::StoreInst:
       Uses.push_back({ NewInst, CopyAddrKind });
+      NonLoadUses.insert(NewInst);
       continue;
 
     case ValueKind::CopyValueInst: