proc.c: show the given name

* proc.c (method_inspect): show the given name primarily, and
  original_id if aliased.  [ruby-core:52048] [Bug #7806]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
proc.c: original_name

* proc.c (method_original_name): new methods Method#original_name and
  UnboundMethod#original_name.  [ruby-core:52048] [Bug #7806]
  [EXPERIMENTAL]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39223 b2dd03c8-39d4-4d8f-98ff-823fe69b080e