[C++20] [Modules] Merge codes to decide if we should generate decl There are two piece of codes in ASTWriterDecl to decide whether or not we should generate a function or a variable in current module unit (or PCH with object file extension, which is rarely used). One is in Visit*Decl and One is in `CanElideDef`. Since they are similar it should be better to merge them. This was meant to be a NFC patch. But it seems it helped me to find an existing bug.
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