GLSL/Vulkan: Warn about arrays of arrays of resources that need bindings.

Initial way of addressing #1362.

glslang/MachineIndependent/ParseHelper.cpp

@@ -4791,6 +4791,14 @@ void TParseContext::layoutTypeCheck(const TSourceLoc& loc, const TType& type)
         }
     }
 
+    // some things can't have arrays of arrays
+    if (type.isArrayOfArrays()) {
+        if (spvVersion.vulkan > 0) {
+            if (type.isOpaque() || (type.getQualifier().isUniformOrBuffer() && type.getBasicType() == EbtBlock))
+                warn(loc, "Generating SPIR-V array-of-arrays, but Vulkan only supports single array level for this resource", "[][]", "");
+        }
+    }
+
     // "The offset qualifier can only be used on block members of blocks..."
     if (qualifier.hasOffset()) {
         if (type.getBasicType() == EbtBlock)