RFR: 8178806: Better exception logging in crypto code [v2]

[Kevin Driver]

> Updated this `template` file to not fail silently on `canUseProvider` check in debug mode to provide additional information to aid in debugging.
> 
> See: https://bugs.openjdk.org/browse/JDK-8178806

Kevin Driver has updated the pull request incrementally with one additional commit since the last revision:

  just use default toString

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12504/files
  - new: https://git.openjdk.org/jdk/pull/12504/files/517ab671..d73df1b2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12504&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12504&range=00-01

  Stats: 7 lines in 1 file changed: 0 ins; 5 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12504.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12504/head:pull/12504

PR: https://git.openjdk.org/jdk/pull/12504