[orc-rt] Add error.h: structured error support. #154869
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Adds support for the Error class, Expected class template, and related APIs that will be used for error propagation and handling in the new ORC runtime. The implementations of these types are cut-down versions of similar APIs in llvm/Support/Error.h. Most advice on llvm::Error and llvm::Expected (e.g. from the LLVM Programmer's manual) applies equally to orc_rt::Error and orc_rt::Expected. Ported from the old ORC runtime at compiler-rt/lib/orc.
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Adds support for the Error class, Expected class template, and related APIs that will be used for error propagation and handling in the new ORC runtime.
The implementations of these types are cut-down versions of similar APIs in llvm/Support/Error.h. Most advice on llvm::Error and llvm::Expected (e.g. from the LLVM Programmer's manual) applies equally to orc_rt::Error and orc_rt::Expected.
Ported from the old ORC runtime at compiler-rt/lib/orc.