RFR: 8058176: [mlvm] tests should not allow code cache exhaustion

[Evgeny Nikitin]

Another approach to the JDK-8058176 and #2440 - never allowing the tests hit CodeCache limits. The most significant consumer is the MH graph builder (the MHTransformationGen), whose consumption is now controlled. List of changes:

* Code cache size getters are added to WhiteBox;
* MH sequences are now built with remaining Code cache size in mind (always let 2M clearance);
* Dependencies on WhiteBox added for all affected tests;
* The test cases in question un-problemlisted.

Testing: the whole vmTestbase/vm/mlvm/ in win-lin-mac x86.

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

Commit messages:
 - Un-problemlist the OOME tests
 - Add CodeCache methods to the WhiteBox
 - 8058176: [mlvm] tests should not allow code cache exhaustion

Changes: https://git.openjdk.java.net/jdk/pull/2523/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2523&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8058176
  Stats: 102 lines in 13 files changed: 88 ins; 6 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2523.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2523/head:pull/2523

PR: https://git.openjdk.java.net/jdk/pull/2523