[dart2wasm] Avoid indirect call to `key.hashCode` in json map creations After a recent change we started to eagerly calculate the hash code of json object keys so when we create the string objects we initialize the hash as well (as we know it will be needed to create the map). This means that the actual creation of the hash map can do less work. Right now it does an indirect call to `key.hashCode`, but since we know those particular maps from the json decoder come only with string keys and most of them will have their hash code already prepopulated we can get avoid the indirect call to `key.hashCode` in most cases. Change-Id: I38987281bd8b216832cac950ea74d0ca201ff651 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/409980 Reviewed-by: Ömer Ağacan <omersa@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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