[DWARF] Check that all fields of a Unit Header are read.

Tests "dwarfdump-rnglists-dwarf64.s" and "dwarfdump-rnglists.s" were
malformed because they had missing required DWO ID fields in split
compilation unit headers. The patch fixes the tests and checks
the reading of a unit header more thoroughly.

Differential Revision: https://reviews.llvm.org/D71704