|  | ; RUN: opt < %s -simplify-libcalls -disable-output | 
|  | ; PR4645 | 
|  |  | 
|  | define i32 @main() { | 
|  | entry: | 
|  | br label %if.then | 
|  |  | 
|  | lor.lhs.false:		; preds = %while.body | 
|  | br i1 undef, label %if.then, label %for.cond | 
|  |  | 
|  | if.then:		; preds = %lor.lhs.false, %while.body | 
|  | call void @exit(i32 1) | 
|  | br label %for.cond | 
|  |  | 
|  | for.cond:		; preds = %for.end, %if.then, %lor.lhs.false | 
|  | %j.0 = phi i32 [ %inc47, %for.end ], [ 0, %if.then ], [ 0, %lor.lhs.false ]		; <i32> [#uses=1] | 
|  | unreachable | 
|  |  | 
|  | for.end:		; preds = %for.cond20 | 
|  | %inc47 = add i32 %j.0, 1		; <i32> [#uses=1] | 
|  | br label %for.cond | 
|  | } | 
|  |  | 
|  | declare void @exit(i32) |