RFR: First refactoring (thaw_fast) [v2]

[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:

  Fixes to address Coleen's comments.

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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/5bc0eb31..13c6061f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=loom&pr=158&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=loom&pr=158&range=00-01

  Stats: 5 lines in 2 files changed: 2 ins; 0 del; 3 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