the verifier shouldn't modify the IR.

llvm-svn: 85722
diff --git a/llvm/lib/VMCore/Verifier.cpp b/llvm/lib/VMCore/Verifier.cpp
index 6b10d69..5990e48 100644
--- a/llvm/lib/VMCore/Verifier.cpp
+++ b/llvm/lib/VMCore/Verifier.cpp
@@ -661,8 +661,7 @@
     
     // The address of the entry block cannot be taken, unless it is dead.
     if (Entry->hasAddressTaken()) {
-      Entry->removeDeadBlockAddress();
-      Assert1(!Entry->hasAddressTaken(),
+      Assert1(!BlockAddress::get(Entry)->isConstantUsed(),
               "blockaddress may not be used with the entry block!", Entry);
     }
   }