Subzero: Update tests and build scripts for sandboxing.

runtime/szrt_ll.ll

+;;===- subzero/runtime/szrt_ll.ll - Subzero runtime source ----------------===;;
+;;
+;;                        The Subzero Code Generator
+;;
+;; This file is distributed under the University of Illinois Open Source
+;; License. See LICENSE.TXT for details.
+;;
+;;===----------------------------------------------------------------------===;;
+;;
+;; This file implements wrappers for particular bitcode instructions that are
+;; too uncommon and complex for a particular target to bother implementing
+;; directly in Subzero target lowering.  This needs to be compiled by some
+;; non-Subzero compiler.
+;;
+;;===----------------------------------------------------------------------===;;
+
+define <4 x float> @Sz_uitofp_v4i32(<4 x i32> %a) {
+entry:
+  %0 = uitofp <4 x i32> %a to <4 x float>
+  ret <4 x float> %0
+}
+
+define <4 x i32> @Sz_fptoui_v4f32(<4 x float> %a) {
+entry:
+  %0 = fptoui <4 x float> %a to <4 x i32>
+  ret <4 x i32> %0
+}