Merge pull request #7537 from rubygems/deivid-rodriguez/vendor_gem-takes-a-block

Fix resolver to properly intersect Arrays of `Gem::Resolver::Activation` objects

(cherry picked from commit 6a91218)

Author: deivid-rodriguez

lib/rubygems/resolver/spec_specification.rb

@@ -66,4 +66,11 @@ def platform
   def version
     spec.version
   end
+
+  ##
+  # The hash value for this specification.
+
+  def hash
+    spec.hash
+  end
 end

test/rubygems/helper.rb

@@ -1367,12 +1367,12 @@ def v(string)
   #
   # Yields the +specification+ to the block, if given
 
-  def vendor_gem(name = "a", version = 1)
+  def vendor_gem(name = "a", version = 1, &block)
     directory = File.join "vendor", name
 
     FileUtils.mkdir_p directory
 
-    save_gemspec name, version, directory
+    save_gemspec name, version, directory, &block
   end
 
   ##