bitwise operator precedence is wrong

[Andy Edwards]

This probably doesn't affect anything this grammar is being used for, but FWIW...

The grammar defines precedence

  bitOr @left,
  bitXor @left,
  bitAnd @left,

But according to MDN the correct precedence is

7: bitwise AND	left-to-right	Bitwise ANDx & y
6: bitwise XOR	left-to-right	Bitwise XORx ^ y
5: bitwise OR	left-to-right	Bitwise ORx | y

[Marijn Haverbeke]

Thanks for spotting that. Merged.