RFR: 8281222: ciTypeFlow::profiled_count fails "assert(0 <= i && i < _len) failed: illegal index"

[Rickard Bäckman]

This failed in Project Loom with a specific version of TestNG. 

The root cause is that the block that is considered tail doesn't have any _successors, but a couple of _exception "successors".

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Commit messages:
 - 8281222: ciTypeFlow::profiled_count fails "assert(0 <= i && i < _len) failed: illegal index"

Changes: https://git.openjdk.java.net/jdk/pull/7892/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7892&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281222
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7892.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7892/head:pull/7892

PR: https://git.openjdk.java.net/jdk/pull/7892