add a missing break that Reid noticed.

llvm-svn: 25328
diff --git a/llvm/lib/VMCore/Function.cpp b/llvm/lib/VMCore/Function.cpp
index 3abfef9..2f254f9 100644
--- a/llvm/lib/VMCore/Function.cpp
+++ b/llvm/lib/VMCore/Function.cpp
@@ -265,6 +265,7 @@
     if (getName() == "llvm.va_copy")  return Intrinsic::vacopy;
     if (getName() == "llvm.va_end")   return Intrinsic::vaend;
     if (getName() == "llvm.va_start") return Intrinsic::vastart;
+    break;
   case 'w':
     if (getName() == "llvm.writeport") return Intrinsic::writeport;
     if (getName() == "llvm.writeio")   return Intrinsic::writeio;