JDK-7126480 : Make JVM start time in milliseconds since the Java epoch available
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Class Management in management.cpp stores the jvm start time in a class static
called _begin_vm_creation_time. Rather than add an _vm_start_time_millis field
to class os, we can just add an accessor for _begin_vm_creation_time to class
Management and use the latter instead of a new os::vm_start_time_millis().
Add a method os::vm_start_time_millis() that returns the appropriate value.
Use the same initial time as that used for os::elapsed_counter().