RFR: 8304745: Lazily initialize byte[] in java.io.BufferedInputStream [v8]

[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 two additional commits since the last revision:

 - Merge remote-tracking branch 'origin/8304745' into 8304745
   
   # Conflicts:
   #	test/micro/org/openjdk/bench/java/io/BufferedInputStreamBenchmark.java
 - 8304745: Fix line breaks

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13150/files
  - new: https://git.openjdk.org/jdk/pull/13150/files/cb426530..783a383b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13150&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13150&range=06-07

  Stats: 67 lines in 1 file changed: 1 ins; 0 del; 66 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