[11u] RFR: 8261752: Multiple GC test are missing memory requirements

[Christoph Göttschkes]

Hello,

please review the following backport to 11u.

Bug: https://bugs.openjdk.java.net/browse/JDK-8261752
Original commit: https://git.openjdk.java.net/jdk/commit/2e18b52a
Webrev: https://cr.openjdk.java.net/~cgo/8261752/backport-11u.00/

The patch doesn't apply cleanly, because 8249000 [1] and 8244614 [2] 
have not been backported yet and changed a lot of test cases. Applying 
the changes manually was trivial, since it only changes @requires tags 
of some tests.
One of the test cases (TestMetaSpaceLog.java) doesn't exist in 11u.

[1] https://bugs.openjdk.java.net/browse/JDK-8249000
[2] https://bugs.openjdk.java.net/browse/JDK-8244614