diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -383,6 +383,7 @@
 }
 
 const DataLayout &AsmPrinter::getDataLayout() const {
+  assert(MMI && "MMI could not be nullptr!");
   return MMI->getModule()->getDataLayout();
 }
 
@@ -516,6 +517,7 @@
                             CodeViewLineTablesGroupDescription);
     }
     if (!EmitCodeView || M.getDwarfVersion()) {
+      assert(MMI && "MMI could not be nullptr here!");
       if (MMI->hasDebugInfo()) {
         DD = new DwarfDebug(this);
         Handlers.emplace_back(std::unique_ptr<DwarfDebug>(DD), DbgTimerName,
diff --git a/llvm/lib/Target/X86/X86LowerAMXType.cpp b/llvm/lib/Target/X86/X86LowerAMXType.cpp
--- a/llvm/lib/Target/X86/X86LowerAMXType.cpp
+++ b/llvm/lib/Target/X86/X86LowerAMXType.cpp
@@ -494,7 +494,7 @@
   Value *Row = II->getOperand(0);
   Value *Col = II->getOperand(1);
 
-  Instruction *UserI = dyn_cast<Instruction>(U.getUser());
+  Instruction *UserI = cast<Instruction>(U.getUser());
   IRBuilder<> Builder(UserI);
   Value *Stride = Builder.getInt64(64);
   std::array<Value *, 4> Args = {Row, Col, Ptr, Stride};