There's no good reason to track temporaries in ExprWithCleanups,
but it is sometimes useful to track blocks.  Do so.  Also
optimize the storage of these expressions.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144263 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed