Revert "Avoid adding region space bitmap to heap bitmap"

This reverts commit fdb7d5d882a5f18326746cd92e83473be48231eb.

Test failures due to failing the added DCHECK.

Bug: 34967844
Change-Id: If4a6ec70330c7f773b550481c3dd2e7a2e5d4f9a
2 files changed