Revert 85678/85680.  The decision is to stay with the current form of 
indirectbr, thus we don't need "blockaddr(@func, null)".  Eliminate it
for simplicity.

llvm-svn: 85699
diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index df1d19b..9a803a1 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -1065,10 +1065,7 @@
     Out << "blockaddress(";
     WriteAsOperandInternal(Out, BA->getFunction(), &TypePrinter, Machine);
     Out << ", ";
-    if (BA->getBasicBlock())
-      WriteAsOperandInternal(Out, BA->getBasicBlock(), &TypePrinter, Machine);
-    else
-      Out << "null";
+    WriteAsOperandInternal(Out, BA->getBasicBlock(), &TypePrinter, Machine);
     Out << ")";
     return;
   }