Index: lib/Transforms/Scalar/LoopRotation.cpp
===================================================================
--- lib/Transforms/Scalar/LoopRotation.cpp
+++ lib/Transforms/Scalar/LoopRotation.cpp
@@ -111,6 +111,40 @@
       // Anything else can be handled by SSAUpdater.
       SSA.RewriteUse(U);
     }
+    
+    // Replace MetadataAsValue(ValueAsMetadata(OrigHeaderVal)) uses in debug
+    // intrinsics.
+    LLVMContext &C = OrigHeader->getContext();
+    if (auto *VAM = ValueAsMetadata::getIfExists(OrigHeaderVal)) {
+      if (auto *MAV = MetadataAsValue::getIfExists(C, VAM)) {
+        for (auto UI = MAV->use_begin(), E = MAV->use_end(); UI != E; ) {
+          // Grab the use before incrementing the iterator. Otherwise, altering
+          // the Use will invalidate the iterator.
+          Use &U = *UI++;
+          if (DbgInfoIntrinsic *UserInst = dyn_cast<DbgInfoIntrinsic>(U.getUser())) {
+            BasicBlock *UserBB = UserInst->getParent();
+
+            // The original users in the OrigHeader are already using the
+            // original definitions.
+            if (UserBB == OrigHeader)
+              continue;
+            
+            // Users in the OrigPreHeader need to use the value to which the
+            // original definitions are mapped and anything else can be handled
+            // by the SSAUpdater. To avoid adding PHINodes, check if the value
+            // is available in UserBB, if not substitute undef.
+            Value *NewVal;
+            if (UserBB == OrigPreheader)
+              NewVal = OrigPreHeaderVal;
+            else if (SSA.HasValueForBlock(UserBB))
+              NewVal = SSA.GetValueInMiddleOfBlock(UserBB);
+            else
+              NewVal = UndefValue::get(OrigHeaderVal->getType());
+            U = MetadataAsValue::get(C, ValueAsMetadata::get(NewVal));
+          }
+        }
+      }
+    }
   }
 }
 
Index: test/Transforms/LoopRotate/dbgvalue.ll
===================================================================
--- test/Transforms/LoopRotate/dbgvalue.ll
+++ test/Transforms/LoopRotate/dbgvalue.ll
@@ -7,6 +7,7 @@
 ; CHECK-LABEL: define i32 @tak(
 ; CHECK: entry
 ; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %x
+; CHECK: tail call void @llvm.dbg.value(metadata i32 %call
 
 entry:
   br label %tailrecurse
@@ -37,6 +38,44 @@
   ret i32 %z.tr, !dbg !17
 }
 
+define i32 @tak2(i32 %x, i32 %y, i32 %z) nounwind ssp !dbg !0 {
+; CHECK-LABEL: define i32 @tak2(
+; CHECK: entry
+; CHECK: tail call void @llvm.dbg.value(metadata i32 %x.tr
+; CHECK: tail call void @llvm.dbg.value(metadata i32 undef
+
+entry:
+  br label %tailrecurse
+
+tailrecurse:                                      ; preds = %if.then, %entry
+  %x.tr = phi i32 [ %x, %entry ], [ %call, %if.then ]
+  %y.tr = phi i32 [ %y, %entry ], [ %call9, %if.then ]
+  %z.tr = phi i32 [ %z, %entry ], [ %call14, %if.then ]
+  %cmp = icmp slt i32 %y.tr, %x.tr, !dbg !12
+  br i1 %cmp, label %if.then, label %if.end, !dbg !12
+
+if.then:                                          ; preds = %tailrecurse
+  tail call void @llvm.dbg.value(metadata i32 %x.tr, i64 0, metadata !6, metadata !DIExpression()), !dbg !7
+  tail call void @llvm.dbg.value(metadata i32 %y.tr, i64 0, metadata !8, metadata !DIExpression()), !dbg !9
+  tail call void @llvm.dbg.value(metadata i32 %z.tr, i64 0, metadata !10, metadata !DIExpression()), !dbg !11
+  %sub = sub nsw i32 %x.tr, 1, !dbg !14
+  %call = tail call i32 @tak(i32 %sub, i32 %y.tr, i32 %z.tr), !dbg !14
+  %sub6 = sub nsw i32 %y.tr, 1, !dbg !14
+  %call9 = tail call i32 @tak(i32 %sub6, i32 %z.tr, i32 %x.tr), !dbg !14
+  %sub11 = sub nsw i32 %z.tr, 1, !dbg !14
+  %call14 = tail call i32 @tak(i32 %sub11, i32 %x.tr, i32 %y.tr), !dbg !14
+  br label %tailrecurse
+
+if.end:                                           ; preds = %tailrecurse
+  tail call void @llvm.dbg.value(metadata i32 %x.tr, i64 0, metadata !6, metadata !DIExpression()), !dbg !7
+  tail call void @llvm.dbg.value(metadata i32 %y.tr, i64 0, metadata !8, metadata !DIExpression()), !dbg !9
+  tail call void @llvm.dbg.value(metadata i32 %z.tr, i64 0, metadata !10, metadata !DIExpression()), !dbg !11
+  br label %return, !dbg !16
+
+return:                                           ; preds = %if.end
+  ret i32 %z.tr, !dbg !17
+}
+
 @channelColumns = external global i64
 @horzPlane = external global i8*, align 8