Currently `convertSingle` converts the input to `U8List`, but
`convertChunked` works on `Uint8List`. This makes functions common in
both (`decode8`, `decode16`) polymorphic in input.
Update `convertChunked` to also convert the input to `U8List`. With this
`decode8` and `decode16` becomes monomorphic in the input type. Also
update array accesses in these methods to avoid bounds checks.
Check for a few fast cases in `List<int>` to `U8List` copying. If the
list is a `WasmI8ArrayBase` (used in typed data) or `WasmListBase` (used
in lists), we avoid polymorphism, indirections, and bounds checks during
copying.
Golem reports up to 600% improvement in some chunked parsing micro-
benchmarks.
Change-Id: Iddf6dae1a5d77cf574be77313dff779b4715e283
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/395980
Commit-Queue: Ömer Ağacan <omersa@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
Robert Nystrom