Convert remaining callers of BitmapBuilder.add to use .addObject

When setupTipCommitBitmaps is called, writeBitmaps does not have any
bitmaps saved, so these calls to .add always add a single commit and
do not OR in a bitmap.

The objects returned by nextObject after a commit walk is finished
are trees and blobs.  Non-commit objects do not have bitmaps
associated so the call to .add also can only add a single object.

Change-Id: I7b816145251a7fa4f1fffe0d03644257ea7f5440

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapPreparer.java

@@ -410,7 +410,7 @@ class PackWriterBitmapPreparer {
 
 			BitmapBuilder bitmap = commitBitmapIndex.newBitmapBuilder();
 			bitmap.or(reuse);
-			bitmap.add(rc, Constants.OBJ_COMMIT);
+			bitmap.addObject(rc, Constants.OBJ_COMMIT);
 			tipCommitBitmaps.add(new BitmapBuilderEntry(rc, bitmap));
 		}
 
@@ -429,7 +429,7 @@ class PackWriterBitmapPreparer {
 					continue;
 				}
 				for (RevCommit c : rc.getParents()) {
-					bitmap.add(c, Constants.OBJ_COMMIT);
+					bitmap.addObject(c, Constants.OBJ_COMMIT);
 				}
 			}
 			pm.update(1);

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapWalker.java

@@ -129,7 +129,7 @@ final class PackWriterBitmapWalker {
 
 			RevObject ro;
 			while ((ro = walker.nextObject()) != null) {
-				bitmapResult.add(ro, ro.getType());
+				bitmapResult.addObject(ro, ro.getType());
 				pm.update(1);
 			}
 		}