[clang] [serialization] no transitive decl change (PR #92083)

[Jan Svoboda via cfe-commits]

================
@@ -111,6 +109,28 @@ void *Decl::operator new(std::size_t Size, const 
ASTContext &Ctx,
   return ::operator new(Size + Extra, Ctx);
 }
 
+GlobalDeclID Decl::getGlobalID() const {
+  if (!isFromASTFile())
+    return GlobalDeclID();
+  uint64_t ID = *((const uint64_t *)this - 1);
----------------
jansvoboda11 wrote:

Can you explain what this is doing?

https://github.com/llvm/llvm-project/pull/92083
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