Hacky fix for R#2640

After spending most of the day yak shaving for this, decided to just
hack a solution for the release to get the pressure off.  I have a patch
that will fix the re-composing of classes with meta methods in them, but
that also unfortunately disables this hack.

As was observed, a class with a ^parameterize in them will smartmatch
correctly after having done a .^compose on them.  This commit will do that
at the end of compiling the setting for the classes in the setting that
have a ^parameterize method.  This will **not** fix any classes out there
that also have a ^parameterize method.

src/core/core_epilogue.pm6

@@ -31,6 +31,9 @@ BEGIN {
     }
 }
 
+# temporary fix for R#2640
+BEGIN .^compose for Array,array,Bag,BagHash,Hash,Mix,MixHash,Set,SetHash;
+
 {YOU_ARE_HERE}
 
 # vim: ft=perl6 expandtab sw=4