RFR: 8285405: add test and check for negative argument to HashMap::newHashMap et al [v2]

[Jaikiran Pai]

> Can I please get a review of this change which addresses https://bugs.openjdk.java.net/browse/JDK-8285405?
> 
> I've added the test for `LinkedHashMap.newLinkedHashMap(int)` in the existing `test/jdk/java/util/LinkedHashMap/Basic.java` since that test has tests for various APIs of this class.
> 
> For `WeakHashMap.newWeakHashMap` and `HashMap.newHashMap`, I have created new test classes under relevant locations, since these classes already have test classes (almost) per API/feature in those locations.

Jaikiran Pai has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Add tests for the new HashSet#newHashSet and LinkedHashSet#newLinkedHashSet APIs
 - add a check for negative numElements very early in the new APIs of HashSet and LinkedHashSet
 - Merge latest from master branch
 - 8285405: add test and check for negative argument to HashMap::newHashMap et al

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9036/files
  - new: https://git.openjdk.org/jdk/pull/9036/files/9ccebd79..07bbaa91

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9036&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9036&range=00-01

  Stats: 9862 lines in 210 files changed: 8727 ins; 512 del; 623 mod
  Patch: https://git.openjdk.org/jdk/pull/9036.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9036/head:pull/9036

PR: https://git.openjdk.org/jdk/pull/9036