Add cross test for vector itofp and fptoi casts.

runtime/szrt_i686.ll

Index: runtime/szrt_i686.ll
diff --git a/runtime/szrt_i686.ll b/runtime/szrt_i686.ll
new file mode 100644
index 0000000000000000000000000000000000000000..6001506b05e797a02b63a54b5cedbe15122f1148
--- /dev/null
+++ b/runtime/szrt_i686.ll
@@ -0,0 +1,13 @@
+target triple = "i686-pc-linux-gnu"
+
+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
+}