Since Split DWARF needs to name the actual .dwo file that is generated,
it can't be known at the time the llvm::Module is produced as it may be
merged with other Modules before the object is generated and that object
may be generated with any name.
By passing the Split DWARF file name when LLVM is producing object code
the .dwo file name in the object file can match correctly.
The support for Split DWARF for implicit modules remains the same -
using metadata to store the dwo name and dwo id so that potentially
multiple skeleton CUs referring to different dwo files can be generated
from one llvm::Module.
llvm-svn: 301062
Requesting DWARF v5 will now get you the new compile-unit and
type-unit headers. llvm-dwarfdump will also recognize them.
Differential Revision: http://reviews.llvm.org/D30206
llvm-svn: 296514
David Blaikie