8196993: Resolve disabled warnings for libunpack
Summary: captured return values and labelled as fall through to avoid unused-result and implicit-fallthrough gcc warnings
Reviewed-by: mchung
kbarrett [Mon, 11 Jun 2018 22:35:07 -0400] rev 50513
8204097: Simplify OopStorage::AllocateList block entry access
Summary: Removed obsolete support for blocks being in multiple lists.
Reviewed-by: coleenp, tschatzl