[PATCH] [LLD] COFF: Define error categories for Driver, Reader and Resolver.

[Rui Ueyama]

================
Comment at: COFF/Error.h:21
@@ +20,3 @@
+// Driver errors
+enum class DriverError { Success, InvalidOption };
+
----------------
rafael wrote:
> I don't think you need Success. You can just use std::error_code(), no?
Correct. I'll remove that.

Does it make sense to merge all the error categories into one LLDErrorCategory and let the caller distinguish error type by its value? What do you think?

http://reviews.llvm.org/D10129

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