[clang] [clang] Introduce [[clang::lifetime_capture_by(X)]] (PR #111499)

[Haojian Wu via cfe-commits]

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@@ -3379,6 +3379,18 @@ def err_callback_callee_is_variadic : Error<
   "'callback' attribute callee may not be variadic">;
 def err_callback_implicit_this_not_available : Error<
   "'callback' argument at position %0 references unavailable implicit 'this'">;
+
+def err_capture_by_attribute_multiple : Error<
+  "multiple 'lifetime_capture' attributes specified">;
+def err_capture_by_attribute_no_entity : Error<
+  "'lifetime_capture_by' attribute specifies no capturing entity">;
+def err_capture_by_implicit_this_not_available : Error<
+  "'lifetime_capture_by' argument references unavailable implicit 'this'">;
+def err_capture_by_attribute_argument_unknown : Error<
+  "'lifetime_capture_by' attribute argument %0 is not a known function parameter"
+  ". Must be a function parameter of one of 'this', 'global' or 'unknown'">;
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hokein wrote:

We don't use sentence in diagnostic message. `. Must` => `; must`

https://github.com/llvm/llvm-project/pull/111499