%expect: tune the number of conflicts per rule

Currently on a grammar such as

    exp: "number" | exp "+" exp | exp "*" exp

we count only one sr-conflict for both binary rules, i.e., we expect:

    exp: "number" | exp "+" exp  %expect 1 | exp "*" exp  %expect 1

although there are 4 conflicts in total.  That's because in the states
in conflict, for instance that for the "+" rule:

    State 6

        2 exp: exp . "+" exp
        2    | exp "+" exp .  [$end, "+", "*"]
        3    | exp . "*" exp

        "+"  shift, and go to state 4
        "*"  shift, and go to state 5

        "+"       [reduce using rule 2 (exp)]
        "*"       [reduce using rule 2 (exp)]
        $default  reduce using rule 2 (exp)

we count only a single conflict, although there are two (one on "+"
and another with "*").

See https://lists.gnu.org/archive/html/bison-patches/2013-02/msg00106.html.

* src/conflicts.c (rule_has_state_sr_conflicts): Rename as...
(count_rule_state_sr_conflicts): this.
DWIM.
(count_rule_sr_conflicts): Adjust.
* tests/conflicts.at (%expect in grammar rules): New.

tests/conflicts.at

@@ -1280,6 +1280,25 @@ AT_BISON_CHECK([-o input.c input.y])
 AT_CLEANUP
 
 
+## -------------------------- ##
+## %expect in grammar rules.  ##
+## -------------------------- ##
+
+AT_SETUP([%expect in grammar rules])
+
+AT_DATA([input.y],
+[[%expect 4
+%%
+exp:
+  "number"
+| exp "+" exp  %expect 2
+| exp "*" exp  %expect 2
+]])
+
+AT_BISON_CHECK([-o input.c -rall input.y])
+AT_CLEANUP
+
+
 ## ---------------------------------- ##
 ## %expect in grammar rule too much.  ##
 ## ---------------------------------- ##