Bump CI Go versions to 1.16 and 1.17. Update build tags with `go:build` equivalents. Upgrade asmfmt tool for new `go:build` support. Updates #183
Regression test for issue #100 based on the original reported allocation failure.
Based on the pull request
klauspost/compress#186 at
c1f3cf132cd8e214b38cc16e418bf2e501ccda93 with the lines after FIXME
comments re-activated and other minimal edits to make it work in this
environment.
Original code covered by BSD 3-Clause License.