[upstream_utils] Remove patch that results in building with NDEBUG causing ODR issues (#8539)

Semiwrap / meson / robotpy define `NDEBUG` when building their software
in all modes, while `allwplib` only does it when building debug. This
causes the size of `DenseMap` to differ between the shared libraries
built here, and the extension modules built in `mostrobotpy`, causing
segfaults when you try to execute code that uses `DenseMap`. This is not
a problem with the robotpy code in `allwpilib`, because bazel uses the
exact same compiler flags when building the shared libraries and
pybind11 extensions.

upstream_utils/llvm_patches/0015-Use-std-is_trivially_copy_constructible.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: PJ Reiniger <pj.reiniger@gmail.com>
+Date: Sun, 8 May 2022 16:42:09 -0400
+Subject: [PATCH 15/35] Use std::is_trivially_copy_constructible
+
+---
+ llvm/include/llvm/Support/type_traits.h | 16 ----------------
+ 1 file changed, 16 deletions(-)
+
+diff --git a/llvm/include/llvm/Support/type_traits.h b/llvm/include/llvm/Support/type_traits.h
+index 3fd158def34d7256a736f8fb0b30dadea2177864..3171af93fa7ffe4707c03289270cf5951e3db7c5 100644
+--- a/llvm/include/llvm/Support/type_traits.h
++++ b/llvm/include/llvm/Support/type_traits.h
+@@ -76,22 +76,6 @@ union trivial_helper {
+ 
+ } // end namespace detail
+ 
+-template <typename T>
+-struct is_copy_assignable {
+-  template<class F>
+-    static auto get(F*) -> decltype(std::declval<F &>() = std::declval<const F &>(), std::true_type{});
+-    static std::false_type get(...);
+-    static constexpr bool value = decltype(get((T*)nullptr))::value;
+-};
+-
+-template <typename T>
+-struct is_move_assignable {
+-  template<class F>
+-    static auto get(F*) -> decltype(std::declval<F &>() = std::declval<F &&>(), std::true_type{});
+-    static std::false_type get(...);
+-    static constexpr bool value = decltype(get((T*)nullptr))::value;
+-};
+-
+ } // end namespace llvm
+ 
+ #endif // LLVM_SUPPORT_TYPE_TRAITS_H