hash/crc32: fix code generator to use the Go standard
Apply the Go standard for code generation (https://go.dev/s/generatedcode)
to generated crc32_table_ppc64le.s despites this is not
generated Go but Assembly. This is to help prevent changes like CL 478976
that changed the generated output without fixing the generator.
Add gen.go to allow to launch code generation with "go generate".
Change-Id: I8671284265425826c8620dbec055519b992fa04e
Reviewed-on: https://go-review.googlesource.com/c/go/+/556335
Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>