RFR: Renaming cleanup on slow path

Mon Apr 25 19:27:24 UTC 2022

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

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Commit messages:
 - 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

Changes: https://git.openjdk.java.net/loom/pull/170/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=170&range=00
  Stats: 90 lines in 1 file changed: 8 ins; 5 del; 77 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