Support external methods

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/SCCP.cpp

@@ -515,6 +515,7 @@ void SCCP::OperandChangedState(User *U) {
 // to prove whether a value is constant and whether blocks are used.
 //
 bool opt::DoSCCP(Method *M) {
+  if (M->isExternal()) return false;
   SCCP S(M);
   return S.doSCCP();
 }