Cache miss was handled in runtime before. This change add fast path for
Smi in this case.

Perf show 30% improvement for the following example.
Before 67 ms
After 42 ms

const start = new Date();
const MAX = 1000000;
for (var i = 0; i < MAX; i++) {
    i.toString();
}
const end = new Date();
console.log("Time :"+ (end-start));

Change-Id: I162e9c35f58551ca6a5a0efe79fb7c7b482a8594
Bug: v8:10477
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2332866
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69362}