File s2/unit/000-005-bitshift.s2 artifact bfaa121b92 part of check-in b0ac77411e

assert 2 === 1<<1;
assert 64 === 256>>2;
assert 4 === 1<<1<<1;

assert 4 === 1<<1<<1 ||| 0;
assert 4 === 0 || 1<<1<<1 ||| 1;

assert 1 === 0b1;
assert 4 === 0b100;
assert 0xff === 0b11111111;
assert 0b0110 === (0b_11_10 & 0b_01_11);
assert 0b100 === 0b1 << 2;