Add test cases for unions with runtime assignments with typedeffed unions
Add test cases for unions with runtime assignments with typedeffed unions

rbultje/c99-to-c89,libav/c99-to-c89,libav/c99-to-c89,mstorsjo/c99-to-c89,rbultje/c99-to-c89,mstorsjo/c99-to-c89