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[lldb] Remove CommandReturnObject's SetError(StringRef)

Authored by DavidSpickett on Jun 22 2021, 9:12 AM.

Description

[lldb] Remove CommandReturnObject's SetError(StringRef)

Replacing existing uses with AppendError.

SetError is also part of the SBI API. This remains
but instead of calling the underlying SetError it
will call AppendError.

Reviewed By: teemperor

Differential Revision: https://reviews.llvm.org/D104768