RFR: JDK-8321975: Print when add_reserved_region fails even in product mode

[Johan Sjölen]

Hi,

We recently had a user e-mail hotspot-dev about a JVM crash which hit `ShouldNotReachHere` in `add_reserved_region`. As the logging is disabled in product builds the user couldn't supply us with all of the available information, quite unfortunate for us. I propose that we print the region information unconditionally and print the stacks also.

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Commit messages:
 - Check if detailed
 - Print more and even in product

Changes: https://git.openjdk.org/jdk/pull/17086/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17086&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321975
  Stats: 7 lines in 1 file changed: 5 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17086.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17086/head:pull/17086

PR: https://git.openjdk.org/jdk/pull/17086