hg: lanai/lanai: 8234352: fixed memory leaks (for textures)

[artem.bochkarev at jetbrains.com]

Changeset: 23ff785c2fc4
Author:    abochkarev
Date:      2019-11-18 21:22 +0300
URL:       https://hg.openjdk.java.net/lanai/lanai/rev/23ff785c2fc4

8234352: fixed memory leaks (for textures)

also remove unnecessary code that has no sense (given from initial GL impl)

! src/java.desktop/macosx/classes/sun/java2d/metal/MTLPaints.java
! src/java.desktop/macosx/classes/sun/java2d/metal/MTLSurfaceData.java
! src/java.desktop/macosx/classes/sun/java2d/metal/MTLUtilities.java
! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLSurfaceData.m