hg: amber/amber: Fix the invoke bootstrap to preserve variable arity when an

[paul.sandoz at oracle.com]

Changeset: 51f4e03f19d5
Author:    psandoz
Date:      2018-01-18 09:21 -0800
URL:       http://hg.openjdk.java.net/amber/amber/rev/51f4e03f19d5

Fix the invoke bootstrap to preserve variable arity when an
asType transformation is performed.

! src/java.base/share/classes/java/lang/invoke/ConstantBootstraps.java
! test/jdk/java/lang/invoke/condy/ConstantBootstrapsTest.java