branches: 1.1.1.1.48; 1.1.1.1.60;
import GCC 4.1 branch from 20060628.
this includes new fixes for the these 40 GCC PRs:

21210 22541 25161 26223 26347 26559 27020 27082 27158 27177
27227 27421 27601 27648 27665 27666 27689 27722 27733 27781
27790 27793 27802 27806 27807 27819 27821 27830 27842 27858
27861 27884 27933 27951 27959 28045 28109 28110 28112 28151