[AddressLowering] Removed restrictive assert.

Author: nate-chandler

lib/SILOptimizer/Mandatory/AddressLowering.cpp

@@ -1673,7 +1673,11 @@ SILValue AddressMaterialization::materializeDefProjection(SILValue origValue) {
     llvm_unreachable("Unexpected projection from def.");
 
   case ValueKind::CopyValueInst:
-    assert(isStoreCopy(origValue));
+    // This must be a store-copy instruction.  We can't assert that it is at
+    // this point, however, because we're in the midst of rewriting and the
+    // predicate relies on PrunedLiveness.
+    //
+    //      assert(isStoreCopy(origValue));
     return pass.getMaterializedAddress(
         cast<CopyValueInst>(origValue)->getOperand());