Add function recursion testing to the link-time validation.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@23309 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/recurse2.frag

@@ -0,0 +1,28 @@
+#version 330 core
+
+// cross-unit recursion
+
+// two-level recursion
+
+void cfoo(float);
+
+float cbar(int)
+{
+	cfoo(4.2);
+
+	return 3.2;
+}
+
+// four-level, out of order
+
+void CA();
+void CC();
+void CB() { CC(); }
+void CD() { CA(); }
+
+// high degree
+
+void CAT();
+void CCT();
+void CBT() { CCT(); CCT(); CCT(); }
+void CDT() { CAT(); }