RFR: Renamed ContMirror ContinuationWrapper, make cont variable names into…

[Coleen Phillimore]

… continuation if pointing at the Java instance.  Now cont variable names are only for the ContinuationWrapper.
There's only one non-variable name change in vframe.cpp
Running loom-tier1-3 testing in progress.

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Commit messages:
 - Renamed ContMirror ContinuationWrapper, make cont variable names into continuation if pointing at the Java instance.  Now cont variable names are only for the ContinuationWrapper.

Changes: https://git.openjdk.java.net/loom/pull/121/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=121&range=00
  Stats: 264 lines in 15 files changed: 23 ins; 17 del; 224 mod
  Patch: https://git.openjdk.java.net/loom/pull/121.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/121/head:pull/121

PR: https://git.openjdk.java.net/loom/pull/121