[llvm-commits] [PATCH] Replace all uses of std::string* for errors with error_code in Support/MemoryBuffer.

[Michael Spencer]

The two attached patches replace all uses of std::string* for error
handling with error_code in Support/MemoryBuffer and updates clients
to use them.

This will break other projects that use MemoryBuffer directly, but the
conversion is easy. Just use error_code::message(). This will actually
return exactly the same thing for all except one error message, which
now produces a more accurate one.

- Michael Spencer
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