diff --git a/llvm/lib/CodeGen/MachineLICM.cpp b/llvm/lib/CodeGen/MachineLICM.cpp
--- a/llvm/lib/CodeGen/MachineLICM.cpp
+++ b/llvm/lib/CodeGen/MachineLICM.cpp
@@ -638,6 +638,7 @@
   // Since we are moving the instruction out of its basic block, we do not
   // retain its debug location. Doing so would degrade the debugging
   // experience and adversely affect the accuracy of profiling information.
+  assert(!MI->isDebugInstr() && "Should not hoist debug inst");
   MI->setDebugLoc(DebugLoc());
 
   // Add register to livein list to all the BBs in the current loop since a
@@ -841,6 +842,7 @@
 
     // The instruction is is moved from its basic block, so do not retain the
     // debug information.
+    assert(!I->isDebugInstr() && "Should not sink debug inst");
     I->setDebugLoc(DebugLoc());
   }
 }
@@ -1536,6 +1538,7 @@
     // Since we are moving the instruction out of its basic block, we do not
     // retain its debug location. Doing so would degrade the debugging
     // experience and adversely affect the accuracy of profiling information.
+    assert(!MI->isDebugInstr() && "Should not hoist debug inst");
     MI->setDebugLoc(DebugLoc());
 
     // Update register pressure for BBs from header to this block.