Sean Silva 13fa254a61 [yaml2obj][ELF] Allow expressing undefined symbols.
Previously we unconditionally enforced that section references in
symbols in the YAML had a name that was a section name present in the
object, and linked the references to that section. Now, permit empty
section names (already the default, if the `Section` key is not
provided) to indicate SHN_UNDEF.

llvm-svn: 184513
2013-06-21 01:11:48 +00:00
..
2013-04-26 17:54:46 +00:00