RFR: 8304745: Lazily initialize byte[] in java.io.BufferedInputStream [v9]

[Sergey Tsypanov]

> By default `BufferedInputStream` is constructed with internal buffer with capacity 8192. In some cases this buffer is never used, e.g. when we call `IS.readNBytes()` or `IS.readAllBytes()` (relying on `BIS.read1()`) or when `BufferedInputStream` is cascaded.

Sergey Tsypanov has updated the pull request incrementally with one additional commit since the last revision:

  8304745: Add comments for benchmark

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13150/files
  - new: https://git.openjdk.org/jdk/pull/13150/files/783a383b..439460bc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13150&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13150&range=07-08

  Stats: 24 lines in 1 file changed: 23 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13150.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13150/head:pull/13150

PR: https://git.openjdk.org/jdk/pull/13150