hg: jdk/submit: 8198523: Refactor BootstrapMethodInvoker to further avoid runtime type checks

[claes.redestad at oracle.com]

Changeset: b1a5b4ad7427
Author:    redestad
Date:      2018-02-22 11:16 +0100
URL:       http://hg.openjdk.java.net/jdk/submit/rev/b1a5b4ad7427

8198523: Refactor BootstrapMethodInvoker to further avoid runtime type checks
Reviewed-by: psandoz

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