From Anton: switch lowering is still broken somehow.

Consider the folowing code:

define i32 @main(i32 %argc, i8** %argv) {
old_entry1:
        br label %cond_next
cond_next:
        %not.tmp14 = icmp slt i32 %argc, 11
        %hvar2 = zext i1 %not.tmp14 to i32
        switch i32 %hvar2, label %old_entry [
                 i32 -2, label %cond_true
                 i32 -1, label %cond_next
                 i32 0, label %cond_true15
                 i32 1, label %cond_next22
        ]
cond_true15:
        ret i32 1
cond_true:
        ret i32 2
cond_next22:
        ret i32 3
old_entry:
        ret i32 4
}

(Yes, I know, that cases -1 and -2 are really dead).

Resulting binary will always produce result code 4. Commenting out "-1" and "-2"
cases will fix the problem.