Use a BOP for Hash#default

On a hash miss we need to call default if it is redefined in order to
return the default value to be used. Previously we checked this with
rb_method_basic_definition_p, which avoids the method call but requires
a method lookup.

This commit replaces the previous check with BASIC_OP_UNREDEFINED_P and
a new BOP_DEFAULT. We still need to fall back to
rb_method_basic_definition_p when called on a subclasss of hash.

    |                |compare-ruby|built-ruby|
    |:---------------|-----------:|---------:|
    |hash_aref_miss  |       2.692|     3.531|
    |                |           -|     1.31x|

Co-authored-by: Daniel Colson <danieljamescolson@gmail.com>
Co-authored-by: "Ian C. Anderson" <ian@iancanderson.com>
Co-authored-by: Jack McCracken <me@jackmc.xyz>

1 files changed, 1 insertions, 0 deletions

diff --git a/internal/basic_operators.h b/internal/basic_operators.h
index aa63c455b7..2cd9f50073 100644
--- a/internal/basic_operators.h
+++ b/internal/basic_operators.h
@@ -35,6 +35,7 @@ enum ruby_basic_operators {
     BOP_AND,
     BOP_OR,
     BOP_CMP,
+    BOP_DEFAULT,
 
     BOP_LAST_
 };