* lib/rubygems: Update to RubyGems 2.4.5.

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/stub_specification.rb

@@ -42,6 +42,7 @@ class Gem::StubSpecification < Gem::BasicSpecification
     self.loaded_from = filename
     @data            = nil
     @extensions      = nil
+    @name            = nil
     @spec            = nil
   end
 
@@ -49,8 +50,11 @@ class Gem::StubSpecification < Gem::BasicSpecification
   # True when this gem has been activated
 
   def activated?
-    loaded = Gem.loaded_specs[name]
-    loaded && loaded.version == version
+    @activated ||=
+    begin
+      loaded = Gem.loaded_specs[name]
+      loaded && loaded.version == version
+    end
   end
 
   def build_extensions # :nodoc:
@@ -154,9 +158,11 @@ class Gem::StubSpecification < Gem::BasicSpecification
   # The full Gem::Specification for this gem, loaded from evalling its gemspec
 
   def to_spec
-    @spec ||= Gem.loaded_specs.values.find { |spec|
-      spec.name == @name and spec.version == @version
-    }
+    @spec ||= if @data then
+                Gem.loaded_specs.values.find { |spec|
+                  spec.name == name and spec.version == version
+                }
+              end
 
     @spec ||= Gem::Specification.load(loaded_from)
     @spec.ignored = @ignored if instance_variable_defined? :@ignored