[CODEGEN] Fixed bug that caused conditional operator to not always

properly mask load operations

Also includes minor improvement to benchmarking infrastructure

lib/runtime/function.cc

@@ -156,6 +156,7 @@ std::tuple<std::shared_ptr<driver::module>,
   layouts.run(ir);
   peephole.run(ir);
   dce.run(ir);
+//  ir::print(ir, std::cout);
   if(target->is_gpu())
     cts.run(ir);
   align.run(ir);