Improve performance of decompressing jimage files

[Glavo]

I created a PR[1] to improve performance of decompressing jimage files, and
got very good results.
I used `jlink --compress 1 --add-modules jdk.compiler` to generate a javac
runtime image and then used it to compile HelloWorld twenty times,
this PR reduces the total time from 17830ms to 13598ms (31.12% faster).

Can anyone review it? Thank you so much!

Glavo

[1]: https://github.com/openjdk/jdk/pull/16556
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