Some runtime controls for CGC #163
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Adds three
@mpl ... --runtime settings for CGC:max-cc-depth: max depth allowed for a CGC. Default is3. Increasing this enlarges the scope of CGC, the impact of which is not clear yet. In general, we recommend keeping CGC shallow.cc-threshold-ratio: max allowable current-size/survived ratio for CGC. Default is2.0(very eager). Increasing this will increase space usage, and decrease the total amount of work performed by CGC.max-cc-chain-length: max number of simultaneous CGCs allowed per heap. Default2. The impact of this isn't clear yet (should do some experiments)