Crash when using instructions with fancy suffixes

[vbgl]

The following program leads to a crash in register allocation.

export fn cqo128() {
  reg u128 x;
  x = #set0_128();
  x = #CQO_128(x);
}

internal compilation error in function cqo128:
Variable allocation: x (defined at "tests/success/x86-64/cqo.jazz", line 21 (11-12)) and RAX (defined at "", line -1 (-1)) : type mismatch

An ideal fix would be to detect during (pre-)typing that there is no CQO instruction at size 128-bit.