Add new benchmark testing initialize performance (#478)

These benchmarks will stress inlining and load-store forwarding and escape analysis. When each is implemented, we will see a big bump in these benchmarks in ZJIT.

Author: tekknolagi

benchmarks.yml

@@ -202,6 +202,15 @@ object-new:
   category: micro
   single_file: true
   ractor: true
+object-new-initialize:
+  desc: instantiate a new object and call initialize in a loop to test allocation and initialization performance
+  category: micro
+  single_file: true
+  ractor: true
+object-new-no-escape:
+  desc: instantiate new objects with ivars in a loop to test allocation and escape analysis performance
+  category: micro
+  single_file: true
 respond_to:
   desc: respond_to tests the performance of the respond_to? method.
   category: micro

benchmarks/object-new-initialize.rb

@@ -0,0 +1,22 @@
+require_relative '../harness/loader'
+
+class C
+  def initialize(a, b, c, d)
+    @a = a
+    @b = b
+    @c = c
+    @d = d
+  end
+end
+
+def test
+  C.new(1, 2, 3, 4)
+end
+
+run_benchmark(100) do
+  i = 0
+  while i < 1_000_000
+    test
+    i += 1
+  end
+end

benchmarks/object-new-no-escape.rb

@@ -0,0 +1,25 @@
+require_relative '../harness/loader'
+
+class Point
+  attr_reader :x, :y
+  def initialize(x, y)
+    @x = x
+    @y = y
+  end
+
+  def ==(other)
+    @x == other.x && @y == other.y
+  end
+end
+
+def test
+  Point.new(1, 2) == Point.new(1, 2)
+end
+
+run_benchmark(100) do
+  i = 0
+  while i < 1_000_000
+    test
+    i += 1
+  end
+end