Use set literal instead of regex comparison

Author: owen-mc

go/ql/test/library-tests/semmle/go/Types/MethodCount.ql

@@ -1,5 +1,5 @@
 import go
 
 from Type t
-where t.getPackage().getName().regexpMatch("main|pkg1|pkg2")
+where t.getPackage().getName() = ["main", "pkg1", "pkg2"]
 select t.pp(), strictcount(t.getMethod(_))

go/ql/test/library-tests/semmle/go/Types/Methods.ql

@@ -1,5 +1,5 @@
 import go
 
 from Type t, string m
-where t.getPackage().getName().regexpMatch("main|pkg1|pkg2")
+where t.getPackage().getName() = ["main", "pkg1", "pkg2"]
 select t.pp(), m, t.getMethod(m)