hg: jdk-updates/jdk10u: 8204322: += applied to String operands can provoke side effects

[vicente.romero at oracle.com]

Changeset: 1e29a6e55445
Author:    vromero
Date:      2018-06-12 07:20 -0700
URL:       http://hg.openjdk.java.net/jdk-updates/jdk10u/rev/1e29a6e55445

8204322: += applied to String operands can provoke side effects
Reviewed-by: mcimadamore, jlahoda, shade

! src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/StringConcat.java
+ test/jdk/java/lang/String/concat/ImplicitStringConcatAssignLHS.java