Fixes Issue 6717 - Better diagnostic on wrong ASM end token.
Merge pull request #1650 from AndrejMitrovic/Fix6717

Issue 6717 - Better diagnostic on wrong ASM EOL token.
Treat template overload set correctly
fix Issue 8352 - Wrong "__overloadset isn't a template" error
Add test for Issue 9235 - Template mixin doesn't allow to mixin non-conflicting overloads
+1 ti::tempdecls
+2 ti::tempdecls
--cleanup 1st stage (Phobos build&test OK)
Issue 9235 2nd test