Made random generation of BigIntegers faster

[Fabio Romano]

This enhancement makes the generation of random BigIntegers faster, using
directly a random generated int[] magnitude array instead of a byte[]
array. This permits to call trustedStripLeadingZeroInts() instead of
stripLeadingZeroBytes(), in order to avoid copying the contents of the
byte[] array in an int[] array if not necessary, since, unlike the previous
implementation, the int[] array is not used as an argument by the method of
the Random object used to generate random ints.
Link to Pull request: https://github.com/openjdk/jdk/pull/12775
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