Bug ID: JDK-8333375 gtest CollectorPolicy.young_scaled_initial

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CollectorPolicy.young_scaled_initial_ergo()'s comment says

// If NewSize has been ergonomically set, the collector policy
// should use it for min but calculate the initial young size
// using NewRatio.

(https://github.com/openjdk/jdk/blob/master/test/hotspot/gtest/gc/shared/test_collectorPolicy.cpp#L224)


and code has comment that says:
      // If NewSize is set on the command line, we should use it as
      // the initial size, but make sure it is within the heap bounds.

(https://github.com/openjdk/jdk/blob/master/src/hotspot/share/gc/shared/genArguments.cpp#L258)

BTW, I believe CollectorPolicy gtest is fault, please refer to the discussion in JDK-8331675. I think we should convert them to something similar to https://github.com/openjdk/jdk/blob/master/test/hotspot/jtreg/gc/arguments/TestParallelGCErgo.java. GC experts, please confirm.