Implement Integer#ceildiv.

Co-authored-by: Simon LeVasseur <simon.levasseur@shopify.com>

Author: nirvdrum

CHANGELOG.md

@@ -32,6 +32,7 @@ Compatibility:
 * Implement the `Data` class from Ruby 3.2 (#3039, @moste00, @eregon).
 * Make `Coverage.start` and `Coverage.result` accept parameters (#3149, @mtortonesi, @andrykonchin).
 * Implement `rb_check_funcall()` (@eregon).
+* Add `Integer#ceildiv` method (#3039, @simonlevasseur, @nirvdrum).
 
 Performance:
 

spec/tags/core/integer/ceildiv_tags.txt

@@ -88,6 +88,10 @@ def ceil(precision = 0)
     ((self / x) + 1) * x
   end
 
+  def ceildiv(other)
+    -div(-other)
+  end
+
   def coerce(other)
     if Primitive.is_a?(other, Integer)
       return [other, self]