Transforms: Fix bootstrap after r266565

Apparently there isn't test coverage for all of these.  I'd appreciate
if someone with could reproduce and send me something to reduce, but for
now I've just looked for users of RemapInstruction and MapValue and
ensured they don't accidentally insert nullptr.  Here is one of the
bootstraps that caught:

  http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/11494

llvm-svn: 266567

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
index 9f5a43b6d6f..da66da0e85f 100644
--- a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
@@ -94,7 +94,7 @@ static void ConnectProlog(Loop *L, Value *BECount, unsigned Count,
       Value *V = PN->getIncomingValueForBlock(Latch);
       if (Instruction *I = dyn_cast<Instruction>(V)) {
         if (L->contains(I)) {
-          V = VMap[I];
+          V = VMap.lookup(I);
         }
       }
       // Adding a value to the new PHI node from the last prolog block
@@ -199,7 +199,7 @@ static void ConnectEpilog(Loop *L, Value *ModVal, BasicBlock *NewExit,
     Instruction *I = dyn_cast<Instruction>(V);
     if (I && L->contains(I))
       // If value comes from an instruction in the loop add VMap value.
-      V = VMap[I];
+      V = VMap.lookup(I);
     // For the instruction out of the loop, constant or undefined value
     // insert value itself.
     EpilogPN->addIncoming(V, EpilogLatch);
@@ -353,8 +353,8 @@ static void CloneLoopBlocks(Loop *L, Value *NewIter,
       idx = NewPHI->getBasicBlockIndex(Latch);
       Value *InVal = NewPHI->getIncomingValue(idx);
       NewPHI->setIncomingBlock(idx, NewLatch);
-      if (VMap[InVal])
-        NewPHI->setIncomingValue(idx, VMap[InVal]);
+      if (Value *V = VMap.lookup(InVal))
+        NewPHI->setIncomingValue(idx, V);
     }
   }
   if (NewLoop) {