hg: valhalla/valhalla: [lworld] Fix isSubstitutable to check the type of both operands

[mandy.chung at oracle.com]

Changeset: b9061f7e3204
Author:    mchung
Date:      2018-12-19 09:28 -0800
URL:       http://hg.openjdk.java.net/valhalla/valhalla/rev/b9061f7e3204

[lworld] Fix isSubstitutable to check the type of both operands

! src/java.base/share/classes/java/lang/invoke/ValueBootstrapMethods.java
! test/jdk/valhalla/valuetypes/SubstitutabilityTest.java