Faster luau runtime

[Someon1e]

• Check vector equality with a == b instead of a.X == b.X and a.Y == b.Y and a.Z == b.Z

• Replace load_d1(x), load_d2(x) with into_u32(x)

• Branchless popcnt_i32

• Truncate with bor(x, 0) instead of band(x, 0xFFFFFFFF)

• Reorder function assignments

  function TABLE.FUNCTION() ... end
  local f = TABLE.FUNCTION

  local function f() ... end
  TABLE.FUNCTION = f

• Add --!optimize 2 comment directive automatically

[Rerumu]

Solid stuff. Thank you.