Rename the new unsigned and signed keywords to nuw and nsw,
which stand for no-unsigned-wrap and no-signed-wrap.

llvm-svn: 76810
diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index 6e84af3..d9d8cc8 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -856,9 +856,9 @@
   if (const OverflowingBinaryOperator *OBO =
         dyn_cast<OverflowingBinaryOperator>(U)) {
     if (OBO->hasNoUnsignedOverflow())
-      Out << "unsigned ";
+      Out << "nuw ";
     if (OBO->hasNoSignedOverflow())
-      Out << "signed ";
+      Out << "nsw ";
   } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(U)) {
     if (Div->isExact())
       Out << "exact ";