RFR: 8249834: Marked Bug8146568 and Bug8148174 as manual tests.

[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.

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Commit messages:
 - Marked Bug8146568 and Bug8148174 as manual tests.

Changes: https://git.openjdk.org/jdk/pull/9404/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9404&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8249834
  Stats: 6 lines in 3 files changed: 2 ins; 0 del; 4 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