RFR: 8273153: Consolidate file_exists into os:file_exists

Mon Aug 30 22:22:30 UTC 2021

On Mon, 30 Aug 2021 21:29:18 GMT, Yumin Qi <minqi at openjdk.org> wrote:

> This are several places to check if file exists using local similar function, file_exists. They should be consolidated into one version. The patch added a function os::file_exists to do so.
> 
> Tests: tier1

LGTM.

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Marked as reviewed by ccheung (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5308