perf(parser): always inline postfix update parsing (#28429)

Always inline postfix update parsing to remove its 96-byte callee frame
from ordinary expressions.

Native M3 Max versus `1b5a171d28`: +1.50% across five fixtures (+1.19%
clean subset); release parser example +16,512 bytes (+0.99%), including
+1,664 instruction bytes.

AI-assisted with Codex.

crates/oxc_parser/src/js/expression.rs

@@ -1305,7 +1305,8 @@ impl<'a, C: Config> ParserImpl<'a, C> {
         self.parse_postfix_update_expression(start, lhs)
     }
 
-    #[inline]
+    #[expect(clippy::inline_always)]
+    #[inline(always)]
     fn parse_postfix_update_expression(
         &mut self,
         start: u32,