(v0.43) Add a flag to return 0 if only one data point has been recorded #18639
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Currently, getProcessCpuLoad() and getSystemCpuLoad() return -1 if only one data point has been recorded. A compatibility flag -XX:[+/-]CpuLoadCompatibility is added to match the behaviour of the RI, which is to return 0.
Fixes: #13389
Related: eclipse-omr/omr#7189
Port of the following for 0.43
#18636
#18638