upstream_utils/llvm_patches/0025-constexpr-endian-byte-swap.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: PJ Reiniger <pj.reiniger@gmail.com>
Date: Thu, 19 May 2022 01:12:41 -0400
Subject: [PATCH 25/31] constexpr endian byte swap

---
 llvm/include/llvm/Support/Endian.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/include/llvm/Support/Endian.h b/llvm/include/llvm/Support/Endian.h
index 5e7c1e961b9d1e0fd6bcd0c923f678a5e1596860..2e883ff05b7e287151b6031f66d3b4aefd1bf297 100644
--- a/llvm/include/llvm/Support/Endian.h
+++ b/llvm/include/llvm/Support/Endian.h
@@ -55,7 +55,9 @@ inline value_type byte_swap(value_type value, endianness endian) {
 /// Swap the bytes of value to match the given endianness.
 template<typename value_type, endianness endian>
 inline value_type byte_swap(value_type value) {
-  return byte_swap(value, endian);
+  if constexpr ((endian != native) && (endian != system_endianness()))
+    sys::swapByteOrder(value);
+  return value;
 }
 
 /// Read a value of a particular endianness from memory.