RFR: 8252588: HotSpot Style Guide should permit uniform initialization

[Kim Barrett]

Please review and vote on this change to the HotSpot Style Guide to
permit the use of uniform initialization, aka brace initialization, in
HotSpot code.  Uniform initialization is a feature added in C++11.

This is a modification of the Style Guide, so rough consensus among
the HotSpot Group members is required to make this change.  Only Group
members should vote for approval (via the github PR), though reasoned
objectsions or comments from anyone will be considered.  A decision to
approve will not be made before Monday 16-Nov-2020 at 12h00 UTC.

[Note: This is the first attempt to change the Style Guide since the
revision that added a description for a change process (requires rough
consensus of the Group), and also since the start of using git and
github PRs.  I'm making a guess at how to instantiate that process
within the new mechanisms.]

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Commit messages:
 - permit uniform initialization

Changes: https://git.openjdk.java.net/jdk/pull/1119/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1119&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252588
  Stats: 29 lines in 2 files changed: 29 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1119.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1119/head:pull/1119

PR: https://git.openjdk.java.net/jdk/pull/1119