internal/zstd: fix window resizing
Incorrect window resizing led to checksum error and invalid result.
To demonstrate the problem bigData must be a bit bigger, 3x is enough.
This change fixes window resizing, increases bigData size and decouples
TestLargeXXHash from bigData because it uses hardcoded hash value.
Change-Id: I50f74315b083f42e1ccd7ab2093e084f44631bb6
GitHub-Last-Rev:
dbc90ba7a5f24db198cc3eab1c38aad665e41d06
GitHub-Pull-Request: golang/go#62543
Reviewed-on: https://go-review.googlesource.com/c/go/+/527115
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>