Ensure all-caps nested consts marked as autoloaded

Previously, an autoloaded constant `HTML::SomeClass` would not be marked
as autoloaded by AS::Dependencies. This is because the
`#loadable_constants_for_path` method uses `String#camelize` on the
inferred file path, which in turn means that, unless otherwise directed,
AS::Dependencies watches for loaded constants in the `Html` namespace.

By passing the original qualified constant name to `#load_or_require`,
this inference step is avoided, and the new constant is picked up in the
correct namespace.

activesupport/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Ensure that autoloaded constants in all-caps nestings are marked as
+    autoloaded.
+
+    *Simon Coffey*
+
 *   Add String#remove(pattern) as a short-hand for the common pattern of String#gsub(pattern, '')
 
     *DHH*

activesupport/lib/active_support/dependencies.rb

@@ -459,7 +459,7 @@ module ActiveSupport #:nodoc:
         if loaded.include?(expanded)
           raise "Circular dependency detected while autoloading constant #{qualified_name}"
         else
-          require_or_load(expanded)
+          require_or_load(expanded, qualified_name)
           raise LoadError, "Unable to autoload constant #{qualified_name}, expected #{file_path} to define it" unless from_mod.const_defined?(const_name, false)
           return from_mod.const_get(const_name)
         end

activesupport/test/autoloading_fixtures/html/some_class.rb

@@ -0,0 +1,4 @@
+module HTML
+  class SomeClass
+  end
+end

activesupport/test/dependencies_test.rb

@@ -647,6 +647,14 @@ class DependenciesTest < ActiveSupport::TestCase
     Object.class_eval { remove_const :E }
   end
 
+  def test_constants_in_capitalized_nesting_marked_as_autoloaded
+    with_autoloading_fixtures do
+      ActiveSupport::Dependencies.load_missing_constant(HTML, "SomeClass")
+
+      assert ActiveSupport::Dependencies.autoloaded?("HTML::SomeClass")
+    end
+  end
+
   def test_unloadable
     with_autoloading_fixtures do
       Object.const_set :M, Module.new