Index: llvm/lib/IR/AsmWriter.cpp
===================================================================
--- llvm/lib/IR/AsmWriter.cpp
+++ llvm/lib/IR/AsmWriter.cpp
@@ -3846,7 +3846,6 @@
 
 /// printBasicBlock - This member is called for each basic block in a method.
 void AssemblyWriter::printBasicBlock(const BasicBlock *BB) {
-  assert(BB && BB->getParent() && "block without parent!");
   bool IsEntryBlock = BB->isEntryBlock();
   if (BB->hasName()) {              // Print out the label if it exists...
     Out << "\n";
Index: llvm/lib/IR/BasicBlock.cpp
===================================================================
--- llvm/lib/IR/BasicBlock.cpp
+++ llvm/lib/IR/BasicBlock.cpp
@@ -374,7 +374,8 @@
 
 bool BasicBlock::isEntryBlock() const {
   const Function *F = getParent();
-  assert(F && "Block must have a parent function to use this API");
+  if (F == nullptr)
+    return false;
   return this == &F->getEntryBlock();
 }