[DynInst_API:] commit: fixes for non-returning function analysis and loop entries

[Xiaozhu Meng <xmeng@xxxxxxxxxxx>]

Hi all,

The current implementation of the non-returning function analysis
requires call edges to be parsed before call fallthrough edges, which
was violated in my previous commits. This is fixed.

The other fix is for loop information, where entries blocks of loops
were not properly propagated from ParseAPI to PatchAPI. Now loop
information is consistent among parseAPI, patchAPI, and dyninstAPI.

Thanks

--Xiaozhu