RFR: First refactoring (thaw_fast) [v3]

[Frederic Parain]

> Refactoring method thaw_fast() for better encapsulation and readability.

Frederic Parain has updated the pull request incrementally with one additional commit since the last revision:

  Move new methods to ThawBase

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Changes:
  - all: https://git.openjdk.java.net/loom/pull/158/files
  - new: https://git.openjdk.java.net/loom/pull/158/files/13c6061f..ecb1109e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=loom&pr=158&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=loom&pr=158&range=01-02

  Stats: 77 lines in 3 files changed: 37 ins; 38 del; 2 mod
  Patch: https://git.openjdk.java.net/loom/pull/158.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/158/head:pull/158

PR: https://git.openjdk.java.net/loom/pull/158