8017540: Improve multi-threaded contention behavior of radix conversion cache
Summary: Replace array of ArrayList of BigIntegers with a volatile two-dimensional BigInteger array eliminate the synchronization of getRadixConversionCache()
Reviewed-by: plevart, shade, bpb, alanb
Contributed-by: NPeter Levart <peter.levart@gmail.com>, Dmitry Nadezhin <dmitry.nadezhin@oracle.com>, Aleksey Shipilev <aleksey.shipilev@oracle.com>
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