cmd/compile/internal/base: optimize the readImportCfg function to make it clearer
Change-Id: If8fc77d5b04b2979707032d91112d4f33ef5e3da
GitHub-Last-Rev:
d82d769c04569af8a0c99a0ba9a78db641b97368
GitHub-Pull-Request: golang/go#55913
Reviewed-on: https://go-review.googlesource.com/c/go/+/435536
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: shuang cui <imcusg@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>