Use the attribute enums to query if a function has an attribute.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165551 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/MemoryBuiltins.cpp b/lib/Analysis/MemoryBuiltins.cpp
index 7ca670c..0a539fe 100644
--- a/lib/Analysis/MemoryBuiltins.cpp
+++ b/lib/Analysis/MemoryBuiltins.cpp
@@ -132,7 +132,7 @@
 
 static bool hasNoAliasAttr(const Value *V, bool LookThroughBitCast) {
   ImmutableCallSite CS(LookThroughBitCast ? V->stripPointerCasts() : V);
-  return CS && CS.fnHasNoAliasAttr();
+  return CS && CS.hasFnAttr(Attributes::NoAlias);
 }