RFR: 8271949: dumppath in -XX:FlightRecorderOptions does not affect [v2]

[Yasumasa Suenaga]

On Mon, 30 Aug 2021 06:55:35 GMT, Denghui Dong <ddong at openjdk.org> wrote:

>> Emergency dump will be dumped on current work directory now. This default value does not effect. So I changed it to current behavior, and it is nature because other dumps (hs_err, cireplay) are also dumped on current directory.
>
> Make sense, I think we could remove `SecuritySupport.USER_HOME` since no place uses it now.

I removed `SecuritySupport.USER_HOME` in new commit.

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PR: https://git.openjdk.java.net/jdk/pull/5019