branches: 1.1.1.2.24; 1.1.1.2.36; import GCC 4.1-branch from 20080831 / svn 139820.
this fixes at least these GCC PR's:
middle-end/35163 target/34393 middle_end/34150 middle-end/34627 middle-end/33631 c++/34950 c++/34774 c++/35007 libstdc++/20448 libstdc++/20451
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