RFR(T): 8221738: ErrorFile option does not handle pre-existing error files of the same name

[Thomas Stüfe]

Hi all,

May I please have reviews for this small fix:

bug: https://bugs.openjdk.java.net/browse/JDK-8221738
cr:
http://cr.openjdk.java.net/~stuefe/webrevs/8221738-errorfile-option-does-not-handle-pre-existing-error-files-of-the-same-name/webrev.00/webrev/

Fixes a long standing issue where -XX:ErrorFile=<somename> will only work
if <somename> does not exist yet. If it does, error file falls silently
back to "<curdir>/hs_err_pid...".

For more detailed discussions, please see the bug and the associated CSR.

The fix now causes the error file to be overwritten

Thanks, Thomas