First whack at (;;) and [;;] producing LoL

It works for those constructs, but breaks other stuff subtly.
add SEQ(a; b) circumfix to do what (a; b) did

The $() construct also assumes sequence semantics, since it only wants one value.
These are roughly equivalent except where nqp macros need SEQ() to compile down
to the bare sequence of statements without any addition coercion.  $() also works
for code that wants to be backward compatible to pre-lolly days, like spec tests.
Don't loop on 0-art infix:<Z>
Fix @a[*;1]:kv
unbreak zen slices
keep () from disappearing prematurely

also fix tabs
Merge branch 'nom' into lolly

Conflicts:
	src/core/LoL.pm
Add S02-types/array-shapes.t: properly fudged now
Add X::Op::TheseTwo exception
Add candidates for illegal +/- with Instants

using the new X::Op::TheseTwo exception
Revert "Add candidates for illegal +/- with Instants"

This reverts commit 9f4db347c191848101a2baf2b1d02fed37409091.
Revert "Add X::Op::TheseTwo exception"

This reverts commit a22a00a252d8912a92ebfdbd823ac1b634cf5af8.
trap old (;) usages unless LOLLY set
Merge branch 'nom' into lolly

Just to make sure we're in sync.
Add t/spec/S02-types/int-uint.t

This test file is basically a noop at the moment, but will autmatically
become active as soon as 'my int8 $a; say $a.WHAT' says "int8" correctly.
DeTAB
gather should batch an eager reify

Just changing the batch size from 1 to 1000 makes a simple gather/take
run twice as fast, even though it's still doing all the continuations.
make xx about 3 times faster on literals
scale xx better based on size
couple of buglets in previous patch