RFR: 8249834: java/util/ArrayList/Bug8146568.java and j/u/Vector/Bug8148174.java use @ignore w/o bug-id [v2]

[Bill Huang]

> Tests Bug8146568 and Bug8148174 were disabled for high memory consumption, over 17G. This is a task to re-enable these two tests by marking them as manual tests.

Bill Huang has updated the pull request incrementally with one additional commit since the last revision:

  Added missing backslash in jdk/TEST.groups

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9404/files
  - new: https://git.openjdk.org/jdk/pull/9404/files/d37b084d..fc2d6bb0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9404&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9404&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9404.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9404/head:pull/9404

PR: https://git.openjdk.org/jdk/pull/9404