Fix 'unsigned int' overflow in CodeGeneratorJS.pm.
This fixes hashing of "SVG_FEBLEND_MODE_NORMAL". Its hashvalue exceeded 2^32, which
is no problem in perl but in the cpp code. Emulate C/C++ behaviour by using "% 2^32" in
the perl code. Testcase available in feature-branch soon (js-svg-constructors.svg).


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24165 268f45cc-cd09-0410-ab3c-d52691b4dbfc