8257566: Lanai: System runs out of application memory while running the Unmanaged_BufferredImage_draw_NearestNeighbor test multiple times

Author: aghaisas

src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLBlitLoops.m

@@ -172,7 +172,7 @@ void drawTex2Tex(MTLContext *mtlc,
                     dw, dh, dx1, dy1);
         // NOTE: we might want to fill alpha channel when !rfi->hasAlpha
 
-        id<MTLBuffer> buff = [mtlc.device newBufferWithLength:(sw * sh * srcInfo->pixelStride) options:MTLResourceStorageModeManaged];
+        id<MTLBuffer> buff = [[mtlc.device newBufferWithLength:(sw * sh * srcInfo->pixelStride) options:MTLResourceStorageModeManaged] autorelease];
 
         // copy src pixels inside src bounds to buff
         for (int row = 0; row < sh; row++) {
@@ -182,7 +182,7 @@ void drawTex2Tex(MTLContext *mtlc,
         [buff didModifyRange:NSMakeRange(0, buff.length)];
 
         if (rfi->swizzleKernel != nil) {
-            id <MTLBuffer> swizzled = [mtlc.device newBufferWithLength:(sw * sh * srcInfo->pixelStride) options:MTLResourceStorageModeManaged];
+            id <MTLBuffer> swizzled = [[mtlc.device newBufferWithLength:(sw * sh * srcInfo->pixelStride) options:MTLResourceStorageModeManaged] autorelease];
 
             // this should be cheap, since data is already on GPU
             id<MTLCommandBuffer> cb = [mtlc createCommandBuffer];