Flesh out 4.x block redeclaration semantics:

- hide non-redeclared anonymous members
 - array size limit checking
 - illegal member qualifiers
 - additional members


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24406 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/420.vert

@@ -77,3 +77,7 @@ layout(binding = 31) uniform sampler2D sampb5[2]; // ERROR, binding too big
 
 int fgfg(float f, mediump int i);
 int fgfg(float f, highp int i);
+
+out gl_PerVertex {
+    float gl_ClipDistance[4];
+};