RFR: Renaming cleanup on slow path [v3]

[Patricio Chilano Mateo]

> Some renaming on the slow path. Testing loom-tiers1-3.

Patricio Chilano Mateo has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - merge
 - Fred review
 - rename freeze/recurse_freeze & thaw_one_frame/recurse_thaw
 - add frame_bottom variable
 - rename heap_sp to heap_top
 - rename frame_sp to frame_top
 - rename bottom to is_bottom_frame

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Changes: https://git.openjdk.java.net/loom/pull/170/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=170&range=02
  Stats: 92 lines in 1 file changed: 7 ins; 4 del; 81 mod
  Patch: https://git.openjdk.java.net/loom/pull/170.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/170/head:pull/170

PR: https://git.openjdk.java.net/loom/pull/170