This was done by removing unnecessary options/options that only
allowed marginal tweakings to improve performance while at the same time
making the interface cumbersome.

Its emitter handles this.

Simplify usage of LC_OPT_ENT_STR(): The length of the buffer is determined in the macro, not passed as parameter.

This should fix 403.gcc.
A SBB with AM could not fulfill its should_be_same contraint, so the AM gets split from the SBB.
The Load of the AM gets assigned the out register of the SBB, which violates the !in_r5 constraint of the SBB.
Therefore it's necessary to turn the SBB into NOT+ADC.

Correct inaccurate comment: The only corner case of wrong CF in NEG+ADD as replacement for SUB is if both operands are zero.

This fixes opt/fehler194.c.

This also fixes 176.gcc and 300.twolf.