group: Save a normalize_to_zero in gej_add_ge #1078

The code currently switches to the alternative formula for lambda only if (R,M)
= (0,0) but the alternative formula works whenever M = 0: Specifically, M = 0
implies y1 = -y2. If x1 = x2, then a = -b this is the r = infinity case that we
handle separately. If x1 != x2, then the denominator in the alternative formula
is non-zero, so this formula is well-defined.

One needs to carefully check that the infinity assignment is still correct
because now the definition of m_alt at this point in the code has changed. But
this is true:

Case y1 = -y2:
  Then degenerate = true and infinity = ((x1 - x2)Z == 0) & ~a->infinity .
  a->infinity is handled separately.
  And if ~a->infinity, then Z = Z1 != 0,
  so infinity = (x1 - x2 == 0) = (a == -b) by case condition.

Case y1 != -y2:
  Then degenerate = false and infinity = ((y1 + y2)Z == 0) & ~a->infinity .
  a->infinity is handled separately.
  And if ~a->infinity, then Z = Z1 != 0,
  so infinity = (y1 + y2 == 0) = false by case condition.

Co-Authored-By: Pieter Wuille <pieter@wuille.net>