Move -Wswitch-enum to -Wswitch

This matches GCC's documented (& actual) behavior. What Clang had implemented
as -Wswitch-enum was actually GCC's -Wswitch behavior. -Wswitch is on by
default (part of -Wall) and warns if a switch-over-enum, without a default
case, covers all enum values.

-Wswitch-enum, on the other hand, does not have the default clause and should
fire even in the presence of a default. This warning is off by default.

With this change the -Wswitch-enum flag is off-by-default in Clang but has no
functionality at the moment. I'll add that in a future commit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148648 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/switch.cpp b/test/SemaCXX/switch.cpp
index 8a8cf33..5fd6b1a 100644
--- a/test/SemaCXX/switch.cpp
+++ b/test/SemaCXX/switch.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -Wswitch-enum %s
+// RUN: %clang_cc1 -fsyntax-only -verify %s
 
 void test() {
   bool x = true;