hg: jdk/submit: 8198955: String#repeat loop optimization

[james.laskey at oracle.com]

Changeset: fc16b5f193c7
Author:    jlaskey
Date:      2018-03-02 18:10 -0400
URL:       http://hg.openjdk.java.net/jdk/submit/rev/fc16b5f193c7

8198955: String#repeat loop optimization
Reviewed-by: rriggs, redestad, igerasim

! src/java.base/share/classes/java/lang/String.java