dan sinclair 9b726858ff Fast path ASCII in unicode decode.
In the case of ASCII characters, which a lot of WGSL source is, the
decoder can early out after a checking the value.

Change-Id: Iff655565dde23b143fddb95c6c353a917e25e916
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/128120
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
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