RFR: 8348029: Make gtest death tests work with real crash signals

[Thomas Stuefe]

Small change adds a new macro to the gtest TEST macro zoo: `TEST_VM_CRASH_SIGNAL`. This one is a companion to `TEST_VM_FATAL_ERROR_MSG` and `TEST_VM_ASSERT_MSG` and allows to write gtest that test expected crashes to happen. I will need that for a regression test for https://bugs.openjdk.org/browse/JDK-8330174 , among other things.

You use it like this:


TEST_VM_CRASH_SIGNAL(Testtest, test, "SIGSEGV") {
  ... do something that you expect should result in a specific crash ...
}

Note that the string provided is platform dependent (signal names on Posix, SEH names on Windows).

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Commit messages:
 - start

Changes: https://git.openjdk.org/jdk/pull/23191/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23191&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348029
  Stats: 26 lines in 2 files changed: 24 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23191.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23191/head:pull/23191

PR: https://git.openjdk.org/jdk/pull/23191