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.forwardFun.frag

@@ -0,0 +1,39 @@
+#version 100
+
+precision mediump float;
+
+uniform vec4 bigColor;
+varying vec4 BaseColor;
+uniform float d;
+
+void bar();
+float foo(vec4);
+float unreachableReturn();
+
+void main()
+{
+    vec4 color = vec4(foo(BaseColor));
+
+    bar();
+    float f = unreachableReturn();
+    
+    gl_FragColor = color * f;
+}
+
+void bar()
+{
+}
+
+float unreachableReturn()
+{
+    bar();
+    if (d < 4.2)
+        return 1.2;
+    else
+        return 4.5;
+}
+
+float foo(vec4 bar)
+{
+    return bar.x + bar.y;
+}