diff --git a/llvm/include/llvm/IR/IRBuilder.h b/llvm/include/llvm/IR/IRBuilder.h
--- a/llvm/include/llvm/IR/IRBuilder.h
+++ b/llvm/include/llvm/IR/IRBuilder.h
@@ -1568,11 +1568,18 @@
 
   AllocaInst *CreateAlloca(Type *Ty, unsigned AddrSpace,
                            Value *ArraySize = nullptr, const Twine &Name = "") {
-    const DataLayout &DL = BB->getModule()->getDataLayout();
-    Align AllocaAlign = DL.getPrefTypeAlign(Ty);
+    Module *Mod = BB->getModule();
+    MaybeAlign AllocaAlign;
+    if (Mod) {
+      const DataLayout &DL = Mod->getDataLayout();
+      AllocaAlign = DL.getPrefTypeAlign(Ty);
+    }
     return Insert(new AllocaInst(Ty, AddrSpace, ArraySize, AllocaAlign), Name);
   }
 
+  /// Only valid for builders created with blocks that have already been
+  /// inserted into a function. It otherwise necessarily crashes when trying to
+  /// retrieve the module to get the alignment and address space.
   AllocaInst *CreateAlloca(Type *Ty, Value *ArraySize = nullptr,
                            const Twine &Name = "") {
     const DataLayout &DL = BB->getModule()->getDataLayout();
@@ -1648,8 +1655,11 @@
   LoadInst *CreateAlignedLoad(Type *Ty, Value *Ptr, MaybeAlign Align,
                               bool isVolatile, const Twine &Name = "") {
     if (!Align) {
-      const DataLayout &DL = BB->getModule()->getDataLayout();
-      Align = DL.getABITypeAlign(Ty);
+      Module *Mod = BB->getModule();
+      if (Mod) {
+        const DataLayout &DL = Mod->getDataLayout();
+        Align = DL.getABITypeAlign(Ty);
+      }
     }
     return Insert(new LoadInst(Ty, Ptr, Twine(), isVolatile, *Align), Name);
   }
@@ -1706,8 +1716,11 @@
   StoreInst *CreateAlignedStore(Value *Val, Value *Ptr, MaybeAlign Align,
                                 bool isVolatile = false) {
     if (!Align) {
-      const DataLayout &DL = BB->getModule()->getDataLayout();
-      Align = DL.getABITypeAlign(Val->getType());
+      Module *Mod = BB->getModule();
+      if (Mod) {
+        const DataLayout &DL = Mod->getDataLayout();
+        Align = DL.getABITypeAlign(Val->getType());
+      }
     }
     return Insert(new StoreInst(Val, Ptr, isVolatile, Align));
   }