Add some INTERPOLATE variations

[MasterDuke17]

Create INTERPOLATE_ASSERTION and some multis to pull functionality out
of the regular INTERPOLATE multis.

Makes / $rx / and / <$rx> / a bit faster.

Rakudo builds ok and passes make m-test m-spectest.

[MasterDuke17]

For a 10k line file, ./perl6-m -e 'my @l = "sm.sql".IO.lines; my $s = "Perl6"; my $t = now; my @m = @l.grep(/ $s /); say @m.elems; say now - $t' used to take ~2.7s, now it takes ~2.3s. / <$s> / used to take ~11.4s, now it takes ~10.0s.

[AlexDaniel]

Thanks. How come you still have no commit bit?

http://www.perlfoundation.org/contributor_license_agreement print it out, sign it, scan it in (resize your scan to 250KB or less). Email to trademark -at- perlfoundation.org