RFR: JDK-8259539: JDK-8255711 broke trap messages [v2]

[Thomas Stuefe]

> SIGTRAP/SIGILL are used on ppc/aarch64 to implement traps in compiled code (print a trap message and stop with a fatal error).
> 
> JDK-8255711 reworked and unified that coding. Calls down into VMError::report_and_die() had been factored out of platform dependent code. Since that change, traps are handled the same as normal crashes, so we loose the detail message associated with a trap. This functionality should be restored.

Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:

  Remove superfluous return

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2022/files
  - new: https://git.openjdk.java.net/jdk/pull/2022/files/daf7dc50..e9bd7638

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2022&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2022&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2022.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2022/head:pull/2022

PR: https://git.openjdk.java.net/jdk/pull/2022