Add SPV_AMD_shader_early_and_late_fragment_tests

Test/spv.earlyAndlateFragmentTests.frag

@@ -0,0 +1,12 @@
+#version 450 core
+#extension GL_EXT_fragment_shading_rate : enable
+#extension GL_ARB_shader_stencil_export : enable
+#extension GL_ARB_fragment_shader_interlock : enable
+#extension GL_AMD_shader_early_and_late_fragment_tests : enable
+layout(location = 0) flat in int instanceIndex;
+layout(early_and_late_fragment_tests_amd) in;
+layout(depth_less) out float gl_FragDepth;
+void main()
+{
+  gl_FragDepth = float(instanceIndex) / float(81);
+}