git: openjdk/lanai: 8243508: Update alpha blending and compositing functions

[Alexey Ushakov]

Changeset: 7c598392
Author:    Alexey Ushakov <avu at openjdk.org>
Date:      2020-04-27 22:25:31 +0000
URL:       https://git.openjdk.java.net/lanai/commit/7c598392

8243508: Update alpha blending and compositing functions

! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLComposite.h
! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLComposite.m
! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLPipelineStatesStorage.m