hg: jdk/sandbox: 8223885: hs_err and replay file may contain garbage when overwriting existing file

[chris.hegarty at oracle.com]

Changeset: 80991d58b947
Author:    thartmann
Date:      2019-05-15 14:30 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/80991d58b947

8223885: hs_err and replay file may contain garbage when overwriting existing file
Summary: Truncate file before overwriting.
Reviewed-by: stuefe, dholmes

! src/hotspot/share/utilities/vmError.cpp
! test/hotspot/jtreg/ProblemList.txt