RFR: 8287233: Crash in Continuation.enterSpecial: stop: tried to execute native method as non-native [v2]

[Ron Pressler]

> Please review this fix to a continuation-related crash that happens due to a race between the linking and generation of Continuation.enterSpecial.
> 
> Passes Loom tiers 1-5.

Ron Pressler has updated the pull request incrementally with one additional commit since the last revision:

  Change memory barriers

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8926/files
  - new: https://git.openjdk.java.net/jdk/pull/8926/files/5b55ac78..ddf2293f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8926&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8926&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8926.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8926/head:pull/8926

PR: https://git.openjdk.java.net/jdk/pull/8926