RFR: Minor comments on Loom PR

[Coleen Phillimore]

Rather than put these on the PR, here are some minor changes to existing file changes.
Testing with loom-tier1 in progress (tested make test TEST=jdk/jdk/internal/vm/Continuation locally).

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Commit messages:
 - Remove some unused thread functions.
 - Remove unused handshake functions
 - Long lines in frame files.
 - Removed WOWEE comment
 - Move init_offset_of_stack() to well known classes init.
 - fix alignment gap in CodeBlob and some formatting
 - remove unnecessary TRAPS

Changes: https://git.openjdk.java.net/loom/pull/175/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=175&range=00
  Stats: 87 lines in 13 files changed: 25 ins; 52 del; 10 mod
  Patch: https://git.openjdk.java.net/loom/pull/175.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/175/head:pull/175

PR: https://git.openjdk.java.net/loom/pull/175