Teach Function::hasAddressTaken that BlockAddress doesn't really take
the address of a function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156703 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index 1522aa4..d316d52 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -1870,6 +1870,8 @@
 /// function, changing them to FastCC.
 static void ChangeCalleesToFastCall(Function *F) {
   for (Value::use_iterator UI = F->use_begin(), E = F->use_end(); UI != E;++UI){
+    if (isa<BlockAddress>(*UI))
+      continue;
     CallSite User(cast<Instruction>(*UI));
     User.setCallingConv(CallingConv::Fast);
   }
@@ -1890,6 +1892,8 @@
 static void RemoveNestAttribute(Function *F) {
   F->setAttributes(StripNest(F->getAttributes()));
   for (Value::use_iterator UI = F->use_begin(), E = F->use_end(); UI != E;++UI){
+    if (isa<BlockAddress>(*UI))
+      continue;
     CallSite User(cast<Instruction>(*UI));
     User.setAttributes(StripNest(User.getAttributes()));
   }