YJIT: Fix obj.send(:call)

All the method call types need to handle argument shifting in case they're
called by `.send`, and we weren't handling that in `OPTIMIZED_METHOD_TYPE_CALL`.

Lack of shifting caused the stack size assertion in gen_leave() to fail.

Discovered by Rails CI: https://buildkite.com/rails/rails/builds/91705#018516c4-f8f8-469e-bc2d-ddeb25ca8317/1920-2067
Diagnosed with help from `@eileencodes` and `@k0kubun`.

test/ruby/test_yjit.rb

@@ -1022,6 +1022,12 @@ class TestYJIT < Test::Unit::TestCase
     RUBY
   end
 
+  def test_send_to_call
+    assert_compiles(<<~'RUBY', result: :ok)
+      ->{ :ok }.send(:call)
+    RUBY
+  end
+
   private
 
   def code_gc_helpers

yjit/src/codegen.rs

@@ -5938,6 +5938,11 @@ fn gen_send_general(
                             return CantCompile;
                         }
 
+                        // If this is a .send call we need to adjust the stack
+                        if flags & VM_CALL_OPT_SEND != 0 {
+                            handle_opt_send_shift_stack(asm, argc as i32, ctx);
+                        }
+
                         // About to reset the SP, need to load this here
                         let recv_load = asm.load(recv);
 
@@ -6309,7 +6314,7 @@ fn gen_leave(
     ocb: &mut OutlinedCb,
 ) -> CodegenStatus {
     // Only the return value should be on the stack
-    assert!(ctx.get_stack_size() == 1);
+    assert_eq!(1, ctx.get_stack_size());
 
     // Create a side-exit to fall back to the interpreter
     let side_exit = get_side_exit(jit, ocb, ctx);