[classlib][luni] - add cache for file's canonical path
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Key: HARMONY-6200
URL: https://issues.apache.org/jira/browse/HARMONY-6200
Project: Harmony
Issue Type: Sub-task
Components: Classlib
Affects Versions: 5.0M9
Reporter: Regis Xu
File.getCanonicalPath is very time cost and is heavily used by checking file permission. But
in the most of cases, the canonical path is never change, it's better to cache them to avoid
calculate every time. And I found RI also has cache: File.getCanonicalPath doesn't reflect
change in file system real-time.
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