Added some enumTests showing our program does the right thing in bb-history (194.log->195.log)

test/enumAndStuff/unusedEnumConstant.c

+enum{aa, bb, cc}; {{A}}
+enum{aa, bb, cc, dd}; {{B}}
+
+int a = cc;
+/*
+ * check-name: Adding unused enum constatnt
+ * assert-ast: A == B
+ */

test/enumAndStuff/unusedEnumConstant2.c

+typedef enum{aa, bb, cc} e_type; {{A}}
+typedef enum{aa, bb, cc, dd} e_type; {{B}}
+
+e_type e = cc;
+/*
+ * check-name: Adding unused enum constatnt
+ * assert-ast: A != B
+ * obj-not-diff: yes
+ */