hg: jdk/jdk: 8245024: Simplify and eagerly initialize StringConcatFactory

[claes.redestad at oracle.com]

Changeset: fe95add5e0fc
Author:    redestad
Date:      2020-05-15 12:25 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/fe95add5e0fc

8245024: Simplify and eagerly initialize StringConcatFactory
Reviewed-by: psandoz

! src/java.base/share/classes/java/lang/System.java
! src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java