Previously it was storing all the fields of an msf::Layout as
separate members. This is a trivial cleanup to make it store
an msf::Layout directly. This makes the code more readable
since it becomes clear which fields of PDBFile are actually the
msf specific layout information in a sea of other bookkeeping
fields.
llvm-svn: 276460
This provides a better layering of responsibilities among different
aspects of PDB writing code. Some of the MSF related code was
contained in CodeView, and some was in PDB prior to this. Further,
we were often saying PDB when we meant MSF, and the two are
actually independent of each other since in theory you can have
other types of data besides PDB data in an MSF. So, this patch
separates the MSF specific code into its own library, with no
dependencies on anything else, and DebugInfoCodeView and
DebugInfoPDB take dependencies on DebugInfoMsf.
llvm-svn: 276458
