Cherry-pick [Modules] Record whether VarDecl initializers contain side effects (#143739) #10825
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…lvm#143739) Calling `DeclMustBeEmitted` should not lead to more deserialization, as it may occur before previous deserialization has finished. When passed a `VarDecl` with an initializer however, `DeclMustBeEmitted` needs to know whether that initializer contains side effects. When the `VarDecl` is deserialized but the initializer is not, this triggers deserialization of the initializer. To avoid this we add a bit to the serialization format for `VarDecl`s, indicating whether its initializer contains side effects or not, so that the `ASTReader` can query this information directly without deserializing the initializer. rdar://153085264 This is a cherry-pick of 319a51a
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Normally expressions passed to EvaluateInPlace have a type, but not when a VarDecl initializer is evaluated before the untyped ParenListExpr is replaced with a CXXConstructExpr. This can happen in LLDB. In these cases consteval fails.
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