RFR: 8262402: Make CATCH macro assert not fatal

[Coleen Phillimore]

Hopefully, this is a trivial change.   Tested with tier1 on linux, macosx, and windows, product and debug.

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Commit messages:
 - 8262402: Make CATCH macro assert not fatal

Changes: https://git.openjdk.java.net/jdk/pull/2736/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2736&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262402
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2736.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2736/head:pull/2736

PR: https://git.openjdk.java.net/jdk/pull/2736