Make is_* and to_* subs faster

[autarch]

Before ths branch:

                         Rate HasCoercion()->coerce        to_HasCoercion
HasCoercion()->coerce  3477/s                    --                  -79%
to_HasCoercion        16779/s                  383%                    --

                               Rate MooseX::Types Type()->check MooseX::Types is_* plain Moose
MooseX::Types Type()->check  1214/s                          --               -87%        -95%
MooseX::Types is_*           9225/s                        660%                 --        -62%
plain Moose                 24390/s                       1909%               164%          --

And after:

                         Rate HasCoercion()->coerce        to_HasCoercion
HasCoercion()->coerce  3644/s                    --                  -84%
to_HasCoercion        22727/s                  524%                    --

                               Rate MooseX::Types Type()->check plain Moose MooseX::Types is_*
MooseX::Types Type()->check  1258/s                          --        -95%               -97%
plain Moose                 24631/s                       1857%          --               -39%
MooseX::Types is_*          40650/s                       3130%         65%                 --

[karenetheridge]

I squashed the revert-revert commit together with the one that used Sub::Defer, as these two combined show how simple the changes become with the use of Sub::Defer (and pushing any issues off into that module).

released in 0.49!