[committed] Remove stray comma in primary_constraint_error.

[Marek Polacek]

This fixes
cp/parser.c:27134:20: warning: comma at end of enumerator list

Applying to trunk.

2019-12-04  Marek Polacek  <pola...@redhat.com>

        * parser.c (enum primary_constraint_error): Remove stray comma.

diff --git gcc/cp/parser.c gcc/cp/parser.c
index fb030022627..10ff01666b9 100644
--- gcc/cp/parser.c
+++ gcc/cp/parser.c
@@ -27131,7 +27131,7 @@ enum primary_constraint_error
 {
   pce_ok,
   pce_maybe_operator,
-  pce_maybe_postfix,
+  pce_maybe_postfix
 };
 
 /* Returns true if the token(s) following a primary-expression in a