[jdk11u-dev] RFR: 8210495: compiler crashes because of illegal signature in otherwise legal code

[Aditya Mandaleeka]

This is a backport of 8210495.

Fix request for 11u approved here: https://bugs.openjdk.java.net/browse/JDK-8210495

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Commit messages:
 - 8210495: compiler crashes because of illegal signature in otherwise legal code.

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210495
  Stats: 112 lines in 3 files changed: 101 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/14/head:pull/14

PR: https://git.openjdk.java.net/jdk11u-dev/pull/14