8073204: Determining the desired PLAB size adjusts to the the number of threads at the wrong place
Summary: Calculate the desired PLAB value for a single thread and then return desired PLAB size according to the current number of threads when needed
Reviewed-by: ysr, jwilhelm, tschatzl
8074016: Add convenient way of adding custom test targets to hotspot's test makefile
Summary: Moved the line including the custom testlist to after variables are defined, allowing custom rules to use them
Reviewed-by: erikj, sla