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08c004d674
A common use of `ChangeStatus` is as follows: ``` ChangeStatus Changed = ChangeStatus::UNCHANGED; Changed |= foo(); ``` where `foo` returns `ChangeStatus` as well. Currently `ChangeStatus` doesn't support compound assignment, we have to write as ``` Changed = Changed | foo(); ``` which is not that convenient. This patch add the support for compound assignment for `ChangeStatus`. Compound assignment is usually implemented as a member function, and binary arithmetic operator is therefore implemented using compound assignment. However, unlike regular C++ class, enum class doesn't support member functions. As a result, they can only be implemented in the way shown in the patch. Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D106109
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