RFR: 8357915: SecureRandom nextLong memory usage [v2]

[Koushik Muthukrishnan Thirupattur]

> SecureRandom uses straightforward implementations inherited from Random but in the process does double the memory allocations necessary.
> The delegation to SecureRandom.engineNextBytes does not provide `int` or `long` values, the caller must allocate a byte array and assemble the value itself.
> So added an implementation in SecureRandom that call nextBytes(8 bytes) and then convert that to a long.

Koushik Muthukrishnan Thirupattur has updated the pull request incrementally with one additional commit since the last revision:

  8357915: SecureRandom nextLong memory usage

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26005/files
  - new: https://git.openjdk.org/jdk/pull/26005/files/23228fd8..04f859bd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26005&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26005&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26005.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26005/head:pull/26005

PR: https://git.openjdk.org/jdk/pull/26005