7134655: Crash in reference processing when doing single-threaded remarking Summary: Temporarily disabled multi-threaded reference discovery when entering a single-threaded remark phase. Reviewed-by: brutisso, tonyp, jmasa, jcoomes

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# properties file for java runtime plugin to a browser
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# whether to display stdout to a console window (for
# debugging)
plugin.console=false
# the max no. of inactive codebases to keep in cache
plugin.cacheSize=3