Index: lib/Transforms/InstCombine/InstCombineCasts.cpp
===================================================================
--- lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -1820,6 +1820,10 @@
 
       auto *LI = dyn_cast<LoadInst>(IncValue);
       if (LI) {
+        // If the loaded value is used as the load address in the same
+        // instruction, bitcast is necessary to change the value type.
+        if (LI->getOperand(0) == &CI)
+          return nullptr;
         if (LI->hasOneUse() && LI->isSimple())
           continue;
         // If a LoadInst has more than one use, changing the type of loaded