YJIT: Implement duphash (#5009)

`duphash` showed up in the top-20 most frequent exit ops for @jhawthorn's benchmark that renders github.com/about

The implementation was almost exactly the same as `duparray`

Co-authored-by: John Hawthorn <john@hawthorn.email>

Co-authored-by: John Hawthorn <john@hawthorn.email>

1 files changed, 10 insertions, 0 deletions

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index 183b19c3eb..c94c710c4d 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -2268,3 +2268,13 @@ assert_equal "true", %q{
 
     expected == events
 }
+
+# duphash
+assert_equal '{:foo=>123}', %q{
+  def foo
+    {foo: 123}
+  end
+
+  foo
+  foo
+}