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.300layout.frag

@@ -0,0 +1,22 @@
+#version 300 es
+
+precision mediump float;
+
+in vec4 pos;
+in vec3 color;
+
+layout(location = 7) out vec3 c;
+layout(LocatioN = 3) out vec4 p[2];
+
+struct S {
+    vec3 c;
+    float f;
+};
+
+in S s;
+
+void main()
+{
+    c = color + s.c;
+    p[1] = pos * s.f;
+}