perf(core): async op pseudo-codegen and performance work (#18887)

Performance:

```
async_ops.js: 760k -> 1030k (!)
async_ops_deferred.js: 730k -> 770k
Deno.serve bench: 118k -> 124k
WS test w/ third_party/prebuilt/mac/load_test 100 localhost 8000 0 0: unchanged

Startup time: approx 0.5ms slower (13.7 -> 14.2ms)
```

2 files changed, 6 insertions, 2 deletions

diff --git a/cli/bench/async_ops.js b/cli/bench/async_ops.js
index fc04942be..f6c1465d2 100644
--- a/cli/bench/async_ops.js
+++ b/cli/bench/async_ops.js
@@ -17,4 +17,6 @@ async function bench(fun) {
 }
 
 const core = Deno[Deno.internal].core;
-bench(() => core.opAsync("op_void_async"));
+const ops = core.ops;
+const opVoidAsync = ops.op_void_async;
+bench(() => opVoidAsync());
diff --git a/cli/bench/async_ops_deferred.js b/cli/bench/async_ops_deferred.js
index 7a816cf95..2751ad226 100644
--- a/cli/bench/async_ops_deferred.js
+++ b/cli/bench/async_ops_deferred.js
@@ -17,4 +17,6 @@ async function bench(fun) {
 }
 
 const core = Deno[Deno.internal].core;
-bench(() => core.opAsync("op_void_async_deferred"));
+const ops = core.ops;
+const opVoidAsyncDeferred = ops.op_void_async_deferred;
+bench(() => opVoidAsyncDeferred());