git: openjdk/jdk: 8254557: Compiler crashes with java.lang.AssertionError: isSubtype UNKNOWN

[Maurizio Cimadamore]

Changeset: cb6167b2
Author:    Guoxiong Li <lgxbslgx at gmail.com>
Committer: Maurizio Cimadamore <mcimadamore at openjdk.org>
Date:      2020-10-20 15:45:17 +0000
URL:       https://git.openjdk.java.net/jdk/commit/cb6167b2

8254557: Compiler crashes with java.lang.AssertionError: isSubtype UNKNOWN

Reviewed-by: mcimadamore

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java
+ test/langtools/tools/javac/T8254557/T8254557.java