RFR: 8279903: Redundant modulo operation in ECDHKeyAgreement [v2]

[John Jiang]

> In class `sun.security.ec.ECDHKeyAgreement.java`, the last `mod()` in the below line looks redundant,
> 
> BigInteger lhs = y.modPow(BigInteger.valueOf(2), p).mod(p);

John Jiang has updated the pull request incrementally with one additional commit since the last revision:

  update copyright notes

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7042/files
  - new: https://git.openjdk.java.net/jdk/pull/7042/files/4b44997f..6504ac3d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7042&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7042&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7042.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7042/head:pull/7042

PR: https://git.openjdk.java.net/jdk/pull/7042