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.simpleFunctionCall.frag

@@ -0,0 +1,15 @@
+#version 150
+
+uniform vec4 bigColor;
+varying vec4 BaseColor;
+uniform float d;
+
+vec4 foo()
+{
+    return BaseColor;
+}
+
+void main()
+{
+    gl_FragColor = foo();
+}