internal/xcoff: change zeroReaderAt to nobitsSectionReader for .bss with all 0s
Fixes #63337
Change-Id: I239315047e6e4325e2f471108fd764f8dbb7d5b2
GitHub-Last-Rev:
cacdf0a279451ab97e6e6ce3fe0d3a025f5ce3aa
GitHub-Pull-Request: golang/go#64952
Reviewed-on: https://go-review.googlesource.com/c/go/+/553616
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>