[wpiutil] Upgrade to LLVM 18.1.1 (#6405)

upstream_utils/llvm_patches/0031-Replace-deprecated-std-aligned_storage_t.patch

@@ -1,25 +1,25 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Tyler Veness <calcmogul@gmail.com>
 Date: Fri, 15 Sep 2023 18:26:50 -0700
-Subject: [PATCH 31/34] Replace deprecated std::aligned_storage_t
+Subject: [PATCH 31/35] Replace deprecated std::aligned_storage_t
 
 ---
  llvm/include/llvm/ADT/FunctionExtras.h | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)
 
 diff --git a/llvm/include/llvm/ADT/FunctionExtras.h b/llvm/include/llvm/ADT/FunctionExtras.h
-index 1daeae915eb506b32a2d1296d2f0fe4e6dab606e..2e60e34d69914bd9b2197fc0a0e75a8e025674b2 100644
+index 043d8d90fff03d571a923c264b49be37a5dffa09..a62d5ce00d784def5ae21b8d91cea40cee7bf942 100644
 --- a/llvm/include/llvm/ADT/FunctionExtras.h
 +++ b/llvm/include/llvm/ADT/FunctionExtras.h
-@@ -37,6 +37,7 @@
- #include "llvm/ADT/STLForwardCompat.h"
+@@ -38,6 +38,7 @@
+ #include "llvm/Support/Compiler.h"
  #include "llvm/Support/MemAlloc.h"
  #include "llvm/Support/type_traits.h"
 +#include <cstddef>
  #include <cstring>
  #include <memory>
  #include <type_traits>
-@@ -167,8 +168,7 @@ protected:
+@@ -168,8 +169,7 @@ protected:
      // provide four pointers worth of storage here.
      // This is mutable as an inlined `const unique_function<void() const>` may
      // still modify its own mutable members.