Check for validity of aliasee pointer before dereference.

llvm-svn: 50878

llvm/lib/VMCore/Verifier.cpp

@@ -367,6 +367,8 @@ void Verifier::visitGlobalAlias(GlobalAlias &GA) {
   Assert1(GA.hasExternalLinkage() || GA.hasInternalLinkage() ||
           GA.hasWeakLinkage(),
           "Alias should have external or external weak linkage!", &GA);
+  Assert1(GA.getAliasee(),
+          "Aliasee cannot be NULL!", &GA);
   Assert1(GA.getType() == GA.getAliasee()->getType(),
           "Alias and aliasee types should match!", &GA);