[rubygems/rubygems] Make Bundler::Dependency more memory efficient

When resolving from scratch a Gemfile including only `"gem "rails", "~>
8.0.1"`, I get the following results:

### Before

Total allocated: 288.21 MB (3498515 objects)
Total retained:  119.10 MB (1357976 objects)

### After

Total allocated: 277.44 MB (3383182 objects)
Total retained:  117.55 MB (1338622 objects)

https://github.com/rubygems/rubygems/commit/2d3d6e5015

lib/bundler/dependency.rb

@@ -5,28 +5,89 @@ require_relative "shared_helpers"
 
 module Bundler
   class Dependency < Gem::Dependency
-    attr_reader :autorequire
-    attr_reader :groups, :platforms, :gemfile, :path, :git, :github, :branch, :ref, :glob
-
     def initialize(name, version, options = {}, &blk)
       type = options["type"] || :runtime
       super(name, version, type)
 
-      @groups         = Array(options["group"] || :default).map(&:to_sym)
+      @options = options
-      @source         = options["source"]
+    end
-      @path           = options["path"]
-      @git            = options["git"]
-      @github         = options["github"]
-      @branch         = options["branch"]
-      @ref            = options["ref"]
-      @glob           = options["glob"]
-      @platforms      = Array(options["platforms"])
-      @env            = options["env"]
-      @should_include = options.fetch("should_include", true)
-      @gemfile        = options["gemfile"]
-      @force_ruby_platform = options["force_ruby_platform"] if options.key?("force_ruby_platform")
 
-      @autorequire = Array(options["require"] || []) if options.key?("require")
+    def groups
+      @groups ||= Array(@options["group"] || :default).map(&:to_sym)
+    end
+
+    def source
+      return @source if defined?(@source)
+
+      @source = @options["source"]
+    end
+
+    def path
+      return @path if defined?(@path)
+
+      @path = @options["path"]
+    end
+
+    def git
+      return @git if defined?(@git)
+
+      @git = @options["git"]
+    end
+
+    def github
+      return @github if defined?(@github)
+
+      @github = @options["github"]
+    end
+
+    def branch
+      return @branch if defined?(@branch)
+
+      @branch = @options["branch"]
+    end
+
+    def ref
+      return @ref if defined?(@ref)
+
+      @ref = @options["ref"]
+    end
+
+    def glob
+      return @glob if defined?(@glob)
+
+      @glob = @options["glob"]
+    end
+
+    def platforms
+      @platforms ||= Array(@options["platforms"])
+    end
+
+    def env
+      return @env if defined?(@env)
+
+      @env = @options["env"]
+    end
+
+    def should_include
+      @should_include ||= @options.fetch("should_include", true)
+    end
+
+    def gemfile
+      return @gemfile if defined?(@gemfile)
+
+      @gemfile = @options["gemfile"]
+    end
+
+    def force_ruby_platform
+      return @force_ruby_platform if defined?(@force_ruby_platform)
+
+      @force_ruby_platform = @options["force_ruby_platform"]
+    end
+
+    def autorequire
+      return @autorequire if defined?(@autorequire)
+
+      @autorequire = Array(@options["require"] || []) if @options.key?("require")
     end
 
     RUBY_PLATFORM_ARRAY = [Gem::Platform::RUBY].freeze
@@ -36,17 +97,17 @@ module Bundler
     # passed in the `valid_platforms` parameter
     def gem_platforms(valid_platforms)
       return RUBY_PLATFORM_ARRAY if force_ruby_platform
-      return valid_platforms if @platforms.empty?
+      return valid_platforms if platforms.empty?
 
       valid_platforms.select {|p| expanded_platforms.include?(GemHelpers.generic(p)) }
     end
 
     def expanded_platforms
-      @expanded_platforms ||= @platforms.filter_map {|pl| CurrentRuby::PLATFORM_MAP[pl] }.flatten.uniq
+      @expanded_platforms ||= platforms.filter_map {|pl| CurrentRuby::PLATFORM_MAP[pl] }.flatten.uniq
     end
 
     def should_include?
-      @should_include && current_env? && current_platform?
+      should_include && current_env? && current_platform?
     end
 
     def gemspec_dev_dep?
@@ -54,19 +115,19 @@ module Bundler
     end
 
     def current_env?
-      return true unless @env
+      return true unless env
-      if @env.is_a?(Hash)
+      if env.is_a?(Hash)
-        @env.all? do |key, val|
+        env.all? do |key, val|
           ENV[key.to_s] && (val.is_a?(String) ? ENV[key.to_s] == val : ENV[key.to_s] =~ val)
         end
       else
-        ENV[@env.to_s]
+        ENV[env.to_s]
       end
     end
 
     def current_platform?
-      return true if @platforms.empty?
+      return true if platforms.empty?
-      @platforms.any? do |p|
+      platforms.any? do |p|
         Bundler.current_ruby.send("#{p}?")
       end
     end