Make Integer#zero? a separated method and builtin (#3226)

A prerequisite to fix https://bugs.ruby-lang.org/issues/15589 with JIT.
This commit alone doesn't make a significant difference yet, but I thought
this commit should be committed independently.

This method override was discussed in [Misc #16961].

1 files changed, 2 insertions, 0 deletions

diff --git a/NEWS.md b/NEWS.md
index c69321d507..ac6c6de58b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -214,6 +214,8 @@ Excluding feature bug fixes.
 
     * The issues of sdbm will handle at https://github.com/ruby/sdbm
 
+* `Integer#zero?` overrides `Numeric#zero?` for optimization.
+
 ## Stdlib compatibility issues
 
 Excluding feature bug fixes.