================
@@ -896,6 +896,12 @@ def Launder : Builtin {
   let Prototype = "void*(void*)";
 }
 
+def StartObjectLifeTime : Builtin {
+  let Spellings = ["__builtin_start_object_lifetime"];
----------------
frederick-vs-ja wrote:

IMO if the intent of this intrinsic is to handle polymorphic classes (which is 
not covered by `std::start_lifetime_as`), its name should diverge from "plain" 
`start_lifetime`.

https://github.com/llvm/llvm-project/pull/82776
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