Remove the `hasFnAttr' method from Function.

The hasFnAttr method has been replaced by querying the Attributes explicitly. No
intended functionality change.

llvm-svn: 164725
diff --git a/llvm/lib/Analysis/CodeMetrics.cpp b/llvm/lib/Analysis/CodeMetrics.cpp
index acda34b..9a1ca63 100644
--- a/llvm/lib/Analysis/CodeMetrics.cpp
+++ b/llvm/lib/Analysis/CodeMetrics.cpp
@@ -196,7 +196,7 @@
   // as volatile if they are live across a setjmp call, and they probably
   // won't do this in callers.
   exposesReturnsTwice = F->callsFunctionThatReturnsTwice() &&
-    !F->hasFnAttr(Attribute::ReturnsTwice);
+    !F->getFnAttributes().hasReturnsTwiceAttr();
 
   // Look at the size of the callee.
   for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)