RFR: 8284638: store skip buffers in InputStream Object

[liach]

On Sat, 9 Oct 2021 17:08:50 GMT, XenoAmess <duke at openjdk.java.net> wrote:

> in extream situation, when doing this.skipBuffer = skipBuffer in Thread B, it might make this.skipBuffer to a byte[6] in thread A, and thus cause a IndexOutofBoundException in Thread A.

No, it won't. The later `skipBuffer` references are made to the local variable; so even though the `new byte[6]` may replace the cached `new byte[10]` skip buffer in instance field, in thread A, it is still using the old `new byte[10]` which is stored in the local variable/stack, and everything just proceeds fine (only shortcoming is that the 10-length skip buffer is wasted and recycled)

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PR: https://git.openjdk.java.net/jdk/pull/5872