RFR: 8258838: Remove JVM option UseStackBanging [v2]

[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:

  fix copyrights, other minot changes

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1988/files
  - new: https://git.openjdk.java.net/jdk/pull/1988/files/86a537b8..34e80423

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1988&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1988&range=00-01

  Stats: 9 lines in 8 files changed: 2 ins; 0 del; 7 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