add some asserts in switch analysis code
add some asserts in switch analysis code

raulgrell/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig,andrewrk/zig,Dimenus/zig,Dimenus/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,Dimenus/zig,andrewrk/zig