6673975: Disable ZapUnusedHeapArea to reduce GC execution times of debug JVM's.
Summary: Mangling the unused space is having an adverse affect on testing with fastdebug builds so turn it off by default.
Reviewed-by: ysr, tonyp
--- a/src/share/vm/runtime/globals.hpp Wed Mar 05 17:37:04 2008 -0800
+++ b/src/share/vm/runtime/globals.hpp Tue Mar 11 14:19:53 2008 -0700
@@ -586,7 +586,7 @@ class CommandLineFlags {
develop(bool, ZapJNIHandleArea, trueInDebug, \
"Zap freed JNI handle space with 0xFEFEFEFE") \
\
- develop(bool, ZapUnusedHeapArea, trueInDebug, \
+ develop(bool, ZapUnusedHeapArea, false, \
"Zap unused heap space with 0xBAADBABE") \
\
develop(bool, PrintVMMessages, true, \