Add a benchmark for JIT-ed code dispatch

benchmark/mjit_exec.yml

@@ -0,0 +1,46 @@
+prelude: |
+  # to be used with: --disable-gems --jit-min-calls=2
+  def compile(call)
+    eval(<<~EOS)
+      #{call}; #{call}
+      if RubyVM::MJIT.enabled?
+        RubyVM::MJIT.pause(wait: true)
+      end
+    EOS
+  end
+benchmark:
+  - name: "mjit_exec_iseq_vme_jit    "
+    prelude: |
+      def jit() end
+      compile('jit')
+    script: jit
+  - name: mjit_exec_iseq_vme_jit_jit
+    prelude: |
+      def jit2() end
+      def jit() jit2() end
+      compile('jit')
+    script: jit
+  - name: mjit_exec_iseq_vme_jit_vme
+    prelude: |
+      def jit2() rescue; end
+      def jit() jit2() end
+      compile('jit')
+    script: jit
+  - name: "mjit_exec_send_vme_jit    "
+    prelude: |
+      def jit() end
+      compile('send(:jit)')
+    script: send(:jit)
+  - name: mjit_exec_send_vme_jit_jit
+    prelude: |
+      def jit2() end
+      def jit() send(:jit2) end
+      compile('send(:jit)')
+    script: send(:jit)
+  - name: mjit_exec_send_vme_jit_vme
+    prelude: |
+      def jit2() rescue; end
+      def jit() send(:jit2) end
+      compile('send(:jit)')
+    script: send(:jit)
+loop_count: 30000000