Jtreg needs to be able to invoke the -XX:+EnableJVMPIInstructionStartEvent flag

Name: ns68243 Date: 08/16/2001

Jtreg needs to be able to invoke the
-XX:+EnableJVMPIInstructionStartEvent flag for jcov use. It can be either
hard-coded in to automatically be sent every time the user invokes jcov, or the
user can enter it.
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