Strength reduce to `CCall` for sends landing in simple C methods

A new optimization pass. Also:
- Printing for `Insn::CCall`
- Wrap `ID` and add convenience method for printing, replacing calls to rb_id2name()

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_zjit.rb b/test/ruby/test_zjit.rb
index 494d474107..444df8e044 100644
--- a/test/ruby/test_zjit.rb
+++ b/test/ruby/test_zjit.rb
@@ -9,6 +9,14 @@ require_relative '../lib/jit_support'
 return unless JITSupport.zjit_supported?
 
 class TestZJIT < Test::Unit::TestCase
+  def test_call_itself
+    assert_compiles '42', <<~RUBY, call_threshold: 2
+      def test = 42.itself
+      test
+      test
+    RUBY
+  end
+
   def test_nil
     assert_compiles 'nil', %q{
       def test = nil