Index: llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
===================================================================
--- llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
+++ llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
@@ -89,25 +89,28 @@
   }
   if (Lazy)
     return;
+
   // Find a reasonable insertion point within the vector.  We skip over
   // (a) units from a different section, (b) units from the same section
   // but with lower offset-within-section.  This keeps units in order
   // within a section, although not necessarily within the object file,
   // even if we do lazy parsing.
-  auto I = this->begin();
+  auto InsertPt = this->begin();
   uint32_t Offset = 0;
   while (Data.isValidOffset(Offset)) {
-    if (I != this->end() &&
-        (&(*I)->getInfoSection() != &Section || (*I)->getOffset() == Offset)) {
-      ++I;
-      continue;
+    if (InsertPt != this->end()) {
+      if (&(*InsertPt)->getInfoSection() != &Section ||
+          (*InsertPt)->getOffset() == Offset) {
+        ++InsertPt;
+        continue;
+      }
     }
     auto U = Parser(Offset, SectionKind, &Section);
     // If parsing failed, we're done with this section.
     if (!U)
       break;
     Offset = U->getNextUnitOffset();
-    I = std::next(this->insert(I, std::move(U)));
+    InsertPt = std::next(this->insert(InsertPt, std::move(U)));
   }
 }