Review request: 8024751: Fix bugs in TraceMetadata

[Stefan Karlsson]

http://cr.openjdk.java.net/~stefank/8024751/webrev.00/

Small fixes two fix some issues when TraceMetadata* flags are turned on.

- TraceMetadataHumongousAllocation crashes.
- TraceMetadataChunkAllocation prints the same block_freelist() multiple 
times.

thanks,
StefanK

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