RFR: 8257534: misc tests failed with "NoClassDefFoundError: Could not initialize class java.util.concurrent.ThreadLocalRandom"

[Coleen Phillimore]

Move the initialization and potential class loading of the MethodType out of eatMemory so that we don't get this OOME while loading this class.
Tested with tier5 and 7.

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

Commit messages:
 - 8257534: vmTestbase/gc/lock/jvmti/alloc/jvmtialloclock03/TestDescription.java failed with "NoClassDefFoundError: Could not initialize class java.util.concurrent.ThreadLocalRandom"

Changes: https://git.openjdk.java.net/jdk/pull/5969/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5969&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257534
  Stats: 12 lines in 1 file changed: 5 ins; 5 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5969.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5969/head:pull/5969

PR: https://git.openjdk.java.net/jdk/pull/5969