@@ -4386,6 +4386,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl 
GD, unsigned BuiltinID,
     return RValue::get(nullptr);
+  case Builtin::BI__builtin_start_object_lifetime:
sam-mccall wrote:

is there something to be commented here about why what we do here is sufficient?
It seems surprising to my very-untrained eye that start_lifetime is the same as 
launder, and we don't need any extra TBAA metadata or so...

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