hg: jdk/submit: 8245756: Reduce bootstrap cost of StringConcatFactory prependers

[claes.redestad at oracle.com]

Changeset: 4487bbef1697
Author:    redestad
Date:      2020-05-27 12:42 +0200
URL:       https://hg.openjdk.java.net/jdk/submit/rev/4487bbef1697

8245756: Reduce bootstrap cost of StringConcatFactory prependers
Reviewed-by: forax, psandoz

! src/java.base/share/classes/java/lang/StringConcatHelper.java
! src/java.base/share/classes/java/lang/System.java
! src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java
! src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java