[llvm-commits] [PATCH] Add symbol flags for thread local, common, and undefined symbol attribute.

[David Meyer]

* Rename ST_External to ST_Unknown. This indicates that the type of symbol
unknown, and is no longer a synonym for being undefined. For example in
ELF, a symbol can be undefined with a known type.
* Add flags SF_ThreadLocal, SF_Common, SF_Undefined to the symbol flags
bitset.
* Implement them all for ELF.
* Implement only SF_Undefined for COFF and MachO, in a way which is
identical to how ST_External was implemented for these classes before.

- pdox
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