compress/bzip2: simplify Huffman tree construction
This change simplifies the construction of the Huffman tree in the
bzip2 package by replacing custom sort logic with the more concise and
idiomatic use of "slices" and "cmp" packages.
Change-Id: I2a8aef146b54b9433038b133d2cc8856ba077c72
GitHub-Last-Rev:
c031bb56635552205c12b87add5f4337a7def74f
GitHub-Pull-Request: golang/go#66817
Reviewed-on: https://go-review.googlesource.com/c/go/+/578438
Reviewed-by: Ian Lance Taylor <iant@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: Cherry Mui <cherryyz@google.com>