Apply ReplaceWithPrimitiveObjectEqual to lib/truffle as well

Author: eregon

.rubocop.yml

@@ -416,6 +416,7 @@ TruffleRuby/ReplaceWithPrimitiveObjectClass:
 TruffleRuby/ReplaceWithPrimitiveObjectEqual:
   Enabled: true
   Include: # inspect *only* these files
+    - lib/truffle/**/*.rb
     - src/main/ruby/**/*.rb
 
 # Supports --auto-correct

lib/truffle/stringio.rb

@@ -494,12 +494,12 @@ def readlines(sep = $/, limit = Undefined, chomp: false)
   end
 
   def reopen(string = nil, mode = Undefined)
-    if string and not string.kind_of? String and mode.equal? Undefined
+    if string and not string.kind_of? String and Primitive.equal?(mode, Undefined)
       stringio = Truffle::Type.coerce_to(string, StringIO, :to_strio)
 
       initialize_copy stringio
     else
-      mode = nil if mode.equal? Undefined
+      mode = nil if Primitive.equal?(mode, Undefined)
       string = '' unless string
 
       initialize string, mode

lib/truffle/truffle/cext.rb

@@ -1186,7 +1186,7 @@ def rb_class_new(superclass)
 
   def rb_define_class_under(mod, name, superclass)
     # nil is TypeError (checked below), false is ArgumentError
-    if false.equal?(superclass)
+    if Primitive.equal?(false, superclass)
       raise ArgumentError, "no super class for `#{name}'"
     end
 

lib/truffle/truffle/ffi_backend/struct.rb

@@ -65,7 +65,7 @@ def initialize(pointer = nil, *args)
     end
 
     def initialize_copy(other)
-      return self if equal?(other)
+      return self if Primitive.equal?(self, other)
 
       @layout = other.layout