Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.7.0

release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.7.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.7.0/tools/clang/docs/ReleaseNotes.html>

Thanks to Ed Maste, Andrew Turner and Antoine Brodin for their help.

Exp-run:	antoine
Relnotes:	yes

1 files changed, 6 insertions, 3 deletions

diff --git a/contrib/libc++/src/system_error.cpp b/contrib/libc++/src/system_error.cpp
index 9c8adc4..18f668f 100644
--- a/contrib/libc++/src/system_error.cpp
+++ b/contrib/libc++/src/system_error.cpp
@@ -7,11 +7,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define _LIBCPP_BUILDING_SYSTEM_ERROR
 #include "__config"
+
+#define _LIBCPP_BUILDING_SYSTEM_ERROR
 #include "system_error"
-#include "string"
+
+#include "config_elast.h"
 #include "cstring"
+#include "string"
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -149,7 +152,7 @@ system_error::__init(const error_code& ec, string what_arg)
             what_arg += ": ";
         what_arg += ec.message();
     }
-    return _VSTD::move(what_arg);
+    return what_arg;
 }
 
 system_error::system_error(error_code ec, const string& what_arg)