Fix grammar

llvm-svn: 20890
diff --git a/llvm/lib/Analysis/IPA/Andersens.cpp b/llvm/lib/Analysis/IPA/Andersens.cpp
index f7989f64..f1be060 100644
--- a/llvm/lib/Analysis/IPA/Andersens.cpp
+++ b/llvm/lib/Analysis/IPA/Andersens.cpp
@@ -568,7 +568,7 @@
 }
 
 /// AddConstraintsForExternalFunction - If this is a call to a "known" function,
-/// add the constraints an return false.  If this is a call to an unknown
+/// add the constraints and return false.  If this is a call to an unknown
 /// function, return true.
 bool Andersens::AddConstraintsForExternalFunction(Function *F) {
   assert(F->isExternal() && "Not an external function!");