[RFC] Representing address space information in DWARF

Hello,

The following set of proposed changes allows targets that support more than one address space to represent the notion of address space in DWARF:
https://reviews.llvm.org/D29670
https://reviews.llvm.org/D29671

https://reviews.llvm.org/D29672

https://reviews.llvm.org/D29673

https://reviews.llvm.org/D29674

Full text of the proposal can be found here: https://www.mail-archive.com/dwarf-discuss@lists.dwarfstd.org/msg00326.html

We invite everyone to take a look, make suggestions and comment.

Thank you,
Konstantin