1; When constant propogating terminator instructions, the basic block iterator
2; was not updated to refer to the final position of the new terminator.  This
3; can be bad, f.e. because constproping a terminator can lead to the 
4; destruction of PHI nodes, which invalidates the iterator!
5;
6; Fixed by adding new arguments to ConstantFoldTerminator
7;
8; RUN: opt < %s -constprop
9
10define void @build_tree(i32 %ml) {
11; <label>:0
12        br label %bb2
13
14bb2:            ; preds = %bb2, %0
15        %reg137 = phi i32 [ %reg140, %bb2 ], [ 12, %0 ]         ; <i32> [#uses=1]
16        %reg138 = phi i32 [ %reg139, %bb2 ], [ 0, %0 ]          ; <i32> [#uses=1]
17        %reg139 = add i32 %reg138, 1            ; <i32> [#uses=1]
18        %reg140 = add i32 %reg137, -1           ; <i32> [#uses=1]
19        br i1 false, label %bb2, label %bb3
20
21bb3:            ; preds = %bb2
22        ret void
23}
24
25