RFR (S) 8030955: assert(_prologue != NULL) failed: prologue pointer must be initialized

[harold seigel]

Hi,

Please review this small fix for bug 8030955.  The assert occurred 
because PerfMemory::destroy() was called multiple times.  The fix 
replaces the assert with a check that immediately returns if 
PerfMemory::destroy() has already been called.

The fix was tested with the accompanying test, JCK lang and vm tests, 
hotspot jtreg tests, and ute quick tests.

Open webrev at: http://cr.openjdk.java.net/~hseigel/bug_8030955/ 
<http://cr.openjdk.java.net/%7Ehseigel/bug_8030955/>

Bug: https://bugs.openjdk.java.net/browse/JDK-8030955

Thanks! Harold