ZJIT: Re-apply attr_writer inlining (#14678)

This re-applies https://github.com/ruby/ruby/pull/14629 / 40bb47665d3ff57e0f2eb5a9fd9e0109617015c9 by reverting https://github.com/ruby/ruby/pull/14673 /  d4393772b89dab4f33c118a284d92dc80cd63c39.

Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>

1 files changed, 42 insertions, 1 deletions

diff --git a/test/ruby/test_zjit.rb b/test/ruby/test_zjit.rb
index 683d53f339..937cf44e19 100644
--- a/test/ruby/test_zjit.rb
+++ b/test/ruby/test_zjit.rb
@@ -1642,7 +1642,7 @@ class TestZJIT < Test::Unit::TestCase
     }, call_threshold: 2, insns: [:opt_send_without_block]
   end
 
-  def test_attr_accessor
+  def test_attr_accessor_getivar
     assert_compiles '[4, 4]', %q{
       class C
         attr_accessor :foo
@@ -1658,6 +1658,47 @@ class TestZJIT < Test::Unit::TestCase
     }, call_threshold: 2, insns: [:opt_send_without_block]
   end
 
+  def test_attr_accessor_setivar
+    assert_compiles '[5, 5]', %q{
+      class C
+        attr_accessor :foo
+
+        def initialize
+          @foo = 4
+        end
+      end
+
+      def test(c)
+        c.foo = 5
+        c.foo
+      end
+
+      c = C.new
+      [test(c), test(c)]
+    }, call_threshold: 2, insns: [:opt_send_without_block]
+  end
+
+  def test_attr_writer
+    assert_compiles '[5, 5]', %q{
+      class C
+        attr_writer :foo
+
+        def initialize
+          @foo = 4
+        end
+
+        def get_foo = @foo
+      end
+
+      def test(c)
+        c.foo = 5
+        c.get_foo
+      end
+      c = C.new
+      [test(c), test(c)]
+    }, call_threshold: 2, insns: [:opt_send_without_block]
+  end
+
   def test_uncached_getconstant_path
     assert_compiles RUBY_COPYRIGHT.dump, %q{
       def test = RUBY_COPYRIGHT