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.functionCall.frag

@@ -0,0 +1,44 @@
+#version 130
+
+uniform vec4 bigColor;
+varying vec4 BaseColor;
+uniform float d;
+
+float h = 0.0;
+
+float foo(vec4 bar)
+{
+    return bar.x + bar.y;
+}
+
+void bar()
+{
+}
+
+float unreachableReturn()
+{
+    if (d < 4.2)
+        return 1.2;
+    else
+        return 4.5;
+    // might be another return inserted here by builders, has to be correct type
+}
+
+float missingReturn()
+{
+    if (d < 4.5) {
+        h = d;
+        return 3.9;
+    }
+}
+
+void main()
+{
+    vec4 color = vec4(foo(BaseColor));
+
+    bar();
+    float f = unreachableReturn();
+    float g = missingReturn();
+    
+    gl_FragColor = color * f * h;
+}