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.conditionalDiscard.frag

@@ -0,0 +1,14 @@
+#version 110
+
+uniform sampler2D tex;
+varying vec2 coord;
+
+void main (void)
+{
+    vec4 v = texture2D(tex, coord);
+
+    if (v == vec4(0.1,0.2,0.3,0.4))
+        discard;
+
+    gl_FragColor = v;
+}