HLSL: Test for issue #699.

Test/hlsl.struct.frag

@@ -30,6 +30,12 @@ struct IN_S {
 float ff5 : packoffset(c101.y) : register(ps_5_0, s[5]);
 float ff6 : packoffset(c102.y) : register(s3[5]);
 
+struct empty {};
+
+struct containEmpty {
+    empty e;
+};
+
 float4 PixelShaderFunction(float4 input, IN_S s) : COLOR0
 {
     class FS {
@@ -39,5 +45,9 @@ float4 PixelShaderFunction(float4 input, IN_S s) : COLOR0
     s3 == s3;
     s2.i = s.ff4;
 
+    containEmpty ce;
+    empty e;
+    e = ce.e;
+
     return input;
 }