Prep for merging 3.4: Undo changes from 3.3 branch

test/Transforms/LoopVectorize/lcssa-crash.ll

 ; RUN: opt < %s  -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
 %type1 = type { %type2 }
 %type2 = type { [0 x i8*], i8**, i32, i32, i32 }
 
 define void @test() nounwind uwtable align 2 {
   br label %for.body.lr.ph.i.i.i
 
 for.body.lr.ph.i.i.i:
   br label %for.body.i.i.i
 
 for.body.i.i.i:
   %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc.i.i.i ], [ 0, %for.body.lr.ph.i.i.i ]
   br label %for.inc.i.i.i
 
 for.inc.i.i.i:
   %indvars.iv.next = add i64 %indvars.iv, 1
   %lftr.wideiv = trunc i64 %indvars.iv.next to i32
   %exitcond = icmp ne i32 %lftr.wideiv, undef
   br i1 %exitcond, label %for.body.i.i.i, label %for.end.i.i.i
 
 for.end.i.i.i:
   %lcssa = phi %type1* [ undef, %for.inc.i.i.i ]
   unreachable
 }
 
-; PR16139
-define void @test2(i8* %x) {
-entry:
-  indirectbr i8* %x, [ label %L0, label %L1 ]
-
-L0:
-  br label %L0
-
-L1:
-  ret void
-}