[libc++][test] Replace a TEST_NOEXCEPT_FALSE with noexcept(false). NFC.

Replace `TEST_NOEXCEPT_FALSE` directly with `noexcept(false)` in
optional hash test which is only run in C++17 or later.
`TEST_NOEXCEPT_FALSE` is only useful in C++03 context where `noexcept`
isn't supported by clang. `TEST_NOEXCEPT_FALSE` now only has one remaining use
in `hash_unique_ptr.pass.cpp`.

diff --git a/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp b/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp
index 49e6bc4..bb8a319 100644 (file)
--- a/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp
@@ -27,7 +27,7 @@ namespace std {
 
 template <>
 struct hash<B> {
-  size_t operator()(B const&) TEST_NOEXCEPT_FALSE { return 0; }
+  size_t operator()(B const&) noexcept(false) { return 0; }
 };
 
 }