Fix flaky when making materialized specs uniq

Sometimes we'll have an heterogenous array of specs which include
`Gem::Specification` objects, which don't define `#identifier`. Let's
use `#full_name` consistently.

lib/bundler/endpoint_specification.rb

@@ -26,10 +26,6 @@ module Bundler
       @platform
     end
 
-    def identifier
-      @__identifier ||= [name, version, platform.to_s]
-    end
-
     # needed for standalone, load required_paths from local gemspec
     # after the gem is installed
     def require_paths

lib/bundler/lazy_specification.rb

@@ -20,7 +20,7 @@ module Bundler
     end
 
     def full_name
-      if platform == Gem::Platform::RUBY
+      @full_name ||= if platform == Gem::Platform::RUBY
         "#{@name}-#{@version}"
       else
         "#{@name}-#{@version}-#{platform}"
@@ -28,15 +28,15 @@ module Bundler
     end
 
     def ==(other)
-      identifier == other.identifier
+      full_name == other.full_name
     end
 
     def eql?(other)
-      identifier.eql?(other.identifier)
+      full_name.eql?(other.full_name)
     end
 
     def hash
-      identifier.hash
+      full_name.hash
     end
 
     ##
@@ -129,10 +129,6 @@ module Bundler
       end
     end
 
-    def identifier
-      @__identifier ||= [name, version, platform.to_s]
-    end
-
     def git_version
       return unless source.is_a?(Bundler::Source::Git)
       " #{source.revision[0..6]}"

lib/bundler/lockfile_parser.rb

@@ -86,7 +86,7 @@ module Bundler
           send("parse_#{@state}", line)
         end
       end
-      @specs = @specs.values.sort_by(&:identifier)
+      @specs = @specs.values.sort_by(&:full_name)
     rescue ArgumentError => e
       Bundler.ui.debug(e)
       raise LockfileError, "Your lockfile is unreadable. Run `rm #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}` " \
@@ -199,7 +199,7 @@ module Bundler
         @current_spec.source = @current_source
         @current_source.add_dependency_names(name)
 
-        @specs[@current_spec.identifier] = @current_spec
+        @specs[@current_spec.full_name] = @current_spec
       elsif spaces.size == 6
         version = version.split(",").map(&:strip) if version
         dep = Gem::Dependency.new(name, version)

lib/bundler/remote_specification.rb

@@ -29,12 +29,8 @@ module Bundler
       @platform = _remote_specification.platform
     end
 
-    def identifier
-      @__identifier ||= [name, version, @platform.to_s]
-    end
-
     def full_name
-      if @platform == Gem::Platform::RUBY
+      @full_name ||= if @platform == Gem::Platform::RUBY
         "#{@name}-#{@version}"
       else
         "#{@name}-#{@version}-#{@platform}"