[clang] [clang] Add __builtin_start_object_lifetime builtin. (PR #82776)

[Erich Keane via cfe-commits]

================
@@ -4386,6 +4386,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl 
GD, unsigned BuiltinID,
 
     return RValue::get(nullptr);
   }
+  case Builtin::BI__builtin_start_object_lifetime:
   case Builtin::BI__builtin_launder: {
----------------
erichkeane wrote:

Should the `TypeRequiresBuiltinLaunder` function be generalized, at least in 
name?

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