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.always-discard2.frag

@@ -0,0 +1,19 @@
+#version 110
+varying vec2 tex_coord;
+
+void main (void)
+{
+    vec4 white = vec4(1.0);
+    vec4 black = vec4(0.2);
+    vec4 color = white;
+
+    // First, cut out our circle
+    float x = tex_coord.x*2.0 - 1.0;
+    float y = tex_coord.y*2.0 - 1.0;
+
+    discard;
+
+
+    gl_FragColor = color;
+
+}