Revert "PackBitmapIndex: Not buffer inflated bitmap in BasePackBitmapIndex"

This reverts commit 3aee92478c, which
increased fetch latency significantly.

Change-Id: Id31a94dff83bf7ab2121718ead819bd08306a0b6
Signed-off-by: Yunjie Li <yunjieli@google.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java

@@ -72,6 +72,7 @@ abstract class BasePackBitmapIndex extends PackBitmapIndex {
 				if (r instanceof EWAHCompressedBitmap) {
 					out = out.xor((EWAHCompressedBitmap) r);
 					out.trim();
+					bitmapContainer = out;
 					return out;
 				}
 				xb = (XorCompressedBitmap) r;