mark operator new(std::nothrow) as noalias (aka __attribute__((malloc))

llvm-svn: 159359
diff --git a/libcxx/include/new b/libcxx/include/new
index 5bcbad0..ae0951a 100644
--- a/libcxx/include/new
+++ b/libcxx/include/new
@@ -96,7 +96,7 @@
     throw(std::bad_alloc)
 #endif
 ;
-_LIBCPP_VISIBLE void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT;
+_LIBCPP_VISIBLE void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
 _LIBCPP_VISIBLE void  operator delete(void* __p) _NOEXCEPT;
 _LIBCPP_VISIBLE void  operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;
 
@@ -105,7 +105,7 @@
     throw(std::bad_alloc)
 #endif
 ;
-_LIBCPP_VISIBLE void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT;
+_LIBCPP_VISIBLE void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
 _LIBCPP_VISIBLE void  operator delete[](void* __p) _NOEXCEPT;
 _LIBCPP_VISIBLE void  operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;