Revert r124518. It broke Linux self-host.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124522 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/BasicBlockUtils.h

@@ -22,10 +22,9 @@
 
 namespace llvm {
 
-class AliasAnalysis;
 class Instruction;
 class Pass;
-class ReturnInst;
+class AliasAnalysis;
 
 /// DeleteDeadBlock - Delete the specified block, which must have no
 /// predecessors.
@@ -172,15 +171,7 @@ BasicBlock *SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P);
 BasicBlock *SplitBlockPredecessors(BasicBlock *BB, BasicBlock *const *Preds,
                                    unsigned NumPreds, const char *Suffix,
                                    Pass *P = 0);
-
-/// FoldReturnIntoUncondBranch - This method duplicates the specified return
-/// instruction into a predecessor which ends in an unconditional branch. If
-/// the return instruction returns a value defined by a PHI, propagate the
-/// right value into the return. It returns the new return instruction in the
-/// predecessor.
-ReturnInst *FoldReturnIntoUncondBranch(ReturnInst *RI, BasicBlock *BB,
-                                       BasicBlock *Pred);
-
+  
 } // End llvm namespace
 
 #endif