glslang SPV tests: Add a set of SPV tests.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31212 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/spv.300BuiltIns.vert

@@ -0,0 +1,17 @@
+#version 300 es
+
+in mediump float ps;
+
+invariant gl_Position;
+
+void main()
+{
+    mediump int i = (4 * gl_VertexID - 10);
+    mediump int j = (4 * gl_VertexID - 10);
+
+    gl_Position = vec4(ps);
+    gl_Position *= float(i);
+
+    gl_PointSize = ps; 
+    gl_PointSize *= float(j);
+}