RFR: JDK-8267163: Rename anonymous loader tests to hidden loader tests [v2]

[Mikhailo Seledtsov]

> Please review this simple change that renames vm/mlvm tests and test package name from anonymous to hidden.
> Testing:
>   Ran open/test/hotspot/jtreg/vmTestbase/vm/mlvm on MacOS-x64: PASS
>   Running open/test/hotspot/jtreg/vmTestbase/vm/mlvm on multiple platforms: in progress ...

Mikhailo Seledtsov has updated the pull request incrementally with one additional commit since the last revision:

  Updated problem list for Xcomp

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5570/files
  - new: https://git.openjdk.java.net/jdk/pull/5570/files/959604ef..de437bc2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5570&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5570&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5570.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5570/head:pull/5570

PR: https://git.openjdk.java.net/jdk/pull/5570