[lworld] RFR: 8242496 [lworld] new and defaultvalue don't perform checks on class to instantiate

[Frederic Parain]

The new and defaultvalue bytecodes currently lack a check to ensure that the class to instantiate is of the right kind.

These changes add checks in both slow and fast path of the interpreter.

Testing:
  - unit test added
  - mach5 tier 1 (all failures were pre-existing)

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Commit messages:
 - Fix tabs and trailing whitespaces
 - Add type checks to new and defaultvalue

Changes: https://git.openjdk.java.net/valhalla/pull/21/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/21/webrev.00
  Stats: 155 lines in 5 files changed: 155 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/21.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/21/head:pull/21

PR: https://git.openjdk.java.net/valhalla/pull/21