Inline <Token as PartialEq<TokenKind>>::eq.

Author: nnethercote

compiler/rustc_ast/src/token.rs

@@ -728,6 +728,7 @@ impl Token {
 }
 
 impl PartialEq<TokenKind> for Token {
+    #[inline]
     fn eq(&self, rhs: &TokenKind) -> bool {
         self.kind == *rhs
     }