add cfg verifier ensuring 1 cfop per block and only 1 user for each mode_X node

[libfirm] / .gitattributes

*.vcxproj           eol=crlf
*.vcproj            eol=crlf
*.dsp               eol=crlf
*.dsw               eol=crlf
*.props             eol=crlf
*.vcxproj.filters   eol=crlf