RFR: 8283056: show abstract machine code for all VM crashes

[Doug Simon]

[JDK-8272586](https://bugs.openjdk.java.net/browse/JDK-8272586) added abstract assembly to hs-err for methods on the stack of the crashing thread. However, it only does this if the crash is due to an unhandled signal. It can also be useful to see assembly for crashes due to failing VM assertions or guarantees. This PR implements this improvement.

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Commit messages:
 - show abstract machine code for all VM crashes

Changes: https://git.openjdk.java.net/jdk/pull/7791/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7791&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283056
  Stats: 4 lines in 1 file changed: 2 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7791.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7791/head:pull/7791

PR: https://git.openjdk.java.net/jdk/pull/7791