RFR: JDK-8296906: VMError::controlled_crash crashes with wrong code and address [v2]

[Thomas Stuefe]

> We have VMError::controlled_crash() in debug builds, whose job is to trigger clearly defined faults to test VM error reporting. VMError::controlled_crash(14) (the numbers don't mean anything and probably should be replaced with clear enums) is to crash with a SIGSEGV + SEGV_MAPERR mapping error at a well-known crash address. But this does not work on Linux, where it generates a SIGSEGV with SI_KERNEL instead. We never noticed since it had not been used in tests so far.
> 
> The reason for SI_KERNEL was that the crash address we use (0xABC0000000000ABC) was outside the user-space address range on Linux. This patch redefines the crash address to a value that really generates a SIGSEGV + SEGV_MAPERR on all our platforms. That's one line; the rest is a new regression test that checks that signal info is printed correctly in hs-err files.

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

  feedback david

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/11122/files
  - new: https://git.openjdk.org/jdk/pull/11122/files/8c67aa70..33b758ca

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11122&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11122&range=00-01

  Stats: 36 lines in 2 files changed: 25 ins; 7 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/11122.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11122/head:pull/11122

PR: https://git.openjdk.org/jdk/pull/11122