Recognize warn and deny as built in attributes

gcc/rust/ChangeLog:

	* util/rust-attributes.cc (__definitions): Add entries for warn
	and deny attributes.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

Author: powerboat9

gcc/rust/util/rust-attributes.cc

@@ -35,6 +35,8 @@ static const BuiltinAttrDefinition __definitions[]
      {Attrs::DERIVE_ATTR, EXPANSION},
      {Attrs::DEPRECATED, STATIC_ANALYSIS},
      {Attrs::ALLOW, STATIC_ANALYSIS},
+     {Attrs::WARN, STATIC_ANALYSIS},
+     {Attrs::DENY, STATIC_ANALYSIS},
      {Attrs::ALLOW_INTERNAL_UNSTABLE, STATIC_ANALYSIS},
      {Attrs::DOC, HIR_LOWERING},
      {Attrs::MUST_USE, STATIC_ANALYSIS},