Added ~, %, &, |, ^, <<, >>,
      %=, &=, |=, ^=, <<=, >>=
to the parser and related enums.

Change-Id: Ic95b2362ec3a066ea5285b195bdcda9b6853fd3f
Reviewed-on: https://swiftshader-review.googlesource.com/3120Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>