GLSL: Disallow unsized arrays of atomic_uint.

Test/baseResults/420.frag.out

@@ -2,8 +2,8 @@
 ERROR: 0:4: 'redeclaration' : all redeclarations must use the same depth layout on gl_FragDepth
 ERROR: 0:11: 'layout qualifier' : can only apply depth layout to gl_FragDepth 
 ERROR: 0:12: 'gl_FragDepth' : cannot redeclare after use 
-WARNING: 0:14: 'atomic_uint' : implicitly sized atomic_uint array treated as having one element for tracking the default offset 
-ERROR: 3 compilation errors.  No code generated.
+ERROR: 0:14: 'atomic_uint' : array must be explicitly sized 
+ERROR: 4 compilation errors.  No code generated.
 
 
 Shader version: 420

glslang/MachineIndependent/ParseHelper.cpp

@@ -4794,12 +4794,8 @@ void TParseContext::fixOffset(const TSourceLoc& loc, TSymbol& symbol)
                 if (symbol.getType().isExplicitlySizedArray())
                     numOffsets *= symbol.getType().getCumulativeArraySize();
                 else {
-                    // TODO: functionality: implicitly-sized atomic_uint arrays.
-                    // We don't know the full size until later.  This might
-                    // be a specification problem, will report to Khronos.  For the
-                    // cases that is not true, the rest of the checking would need
-                    // to be done at link time instead of compile time.
-                    warn(loc, "implicitly sized atomic_uint array treated as having one element for tracking the default offset", "atomic_uint", "");
+                    // "It is a compile-time error to declare an unsized array of atomic_uint."
+                    error(loc, "array must be explicitly sized", "atomic_uint", "");
                 }
             }
             int repeated = intermediate.addUsedOffsets(qualifier.layoutBinding, offset, numOffsets);