RFR: 8258838: Remove JVM option UseStackBanging [v3]

[Harold Seigel]

> Please review this change to remove the JVM develop flag UseStackBanging and always use stack banging.
> 
> The change was tested with tiers 1-2 on Linux, Mac OS, and Windows, tiers 3-5 on Linux x64, and cross-builds on PPC64, Linux32, and S390x.
> 
> Thanks, Harold

Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:

  minor comment changes

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1988/files
  - new: https://git.openjdk.java.net/jdk/pull/1988/files/34e80423..7aabbf2c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1988&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1988&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1988.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1988/head:pull/1988

PR: https://git.openjdk.java.net/jdk/pull/1988