[clang] [Headers][X86] avx ifma - move constexpr to the end of the function attribute lists. NFC. (PR #166523)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon created https://github.com/llvm/llvm-project/pull/166523

Makes it easier to compare constexpr/non-constexpr attribute defines

Allows clang-format to pack the attributes more efficiently

>From 8a0292bac7ca14f76507319b8a3f73dc4aba8377 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev at redking.me.uk>
Date: Wed, 5 Nov 2025 09:31:35 +0000
Subject: [PATCH] [Headers][X86] avx ifma - move constexpr to the end of the
 function attribute lists. NFC.

Makes it easier to compare constexpr/non-constexpr attribute defines

Allows clang-format to pack the attributes more efficiently
---
 clang/lib/Headers/avx512ifmaintrin.h   |  5 ++---
 clang/lib/Headers/avx512ifmavlintrin.h | 13 ++++++-------
 clang/lib/Headers/avxifmaintrin.h      |  8 ++++----
 3 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/clang/lib/Headers/avx512ifmaintrin.h b/clang/lib/Headers/avx512ifmaintrin.h
index 625a8ff66dc60..f73b607df797f 100644
--- a/clang/lib/Headers/avx512ifmaintrin.h
+++ b/clang/lib/Headers/avx512ifmaintrin.h
@@ -17,9 +17,8 @@
 /* Define the default attributes for the functions in this file. */
 #if defined(__cplusplus) && (__cplusplus >= 201103L)
 #define __DEFAULT_FN_ATTRS                                                     \
-  constexpr                                                                    \
-      __attribute__((__always_inline__, __nodebug__, __target__("avx512ifma"), \
-                     __min_vector_width__(512)))
+  __attribute__((__always_inline__, __nodebug__, __target__("avx512ifma"),     \
+                 __min_vector_width__(512))) constexpr
 #else
 #define __DEFAULT_FN_ATTRS                                                     \
   __attribute__((__always_inline__, __nodebug__, __target__("avx512ifma"),     \
diff --git a/clang/lib/Headers/avx512ifmavlintrin.h b/clang/lib/Headers/avx512ifmavlintrin.h
index b377c17166ffb..51d5210e5aa5d 100644
--- a/clang/lib/Headers/avx512ifmavlintrin.h
+++ b/clang/lib/Headers/avx512ifmavlintrin.h
@@ -18,13 +18,13 @@
 /* Define the default attributes for the functions in this file. */
 #if defined(__cplusplus) && (__cplusplus >= 201103L)
 #define __DEFAULT_FN_ATTRS128                                                  \
-  constexpr __attribute__((__always_inline__, __nodebug__,                     \
-                           __target__("avx512ifma,avx512vl"),                  \
-                           __min_vector_width__(128)))
+  __attribute__((__always_inline__, __nodebug__,                               \
+                 __target__("avx512ifma,avx512vl"),                            \
+                 __min_vector_width__(128))) constexpr
 #define __DEFAULT_FN_ATTRS256                                                  \
-  constexpr __attribute__((__always_inline__, __nodebug__,                     \
-                           __target__("avx512ifma,avx512vl"),                  \
-                           __min_vector_width__(256)))
+  __attribute__((__always_inline__, __nodebug__,                               \
+                 __target__("avx512ifma,avx512vl"),                            \
+                 __min_vector_width__(256))) constexpr
 #else
 #define __DEFAULT_FN_ATTRS128                                                  \
   __attribute__((__always_inline__, __nodebug__,                               \
@@ -34,7 +34,6 @@
   __attribute__((__always_inline__, __nodebug__,                               \
                  __target__("avx512ifma,avx512vl"),                            \
                  __min_vector_width__(256)))
-
 #endif
 
 #if !(defined(__AVXIFMA__) || defined(__AVX512IFMA__))
diff --git a/clang/lib/Headers/avxifmaintrin.h b/clang/lib/Headers/avxifmaintrin.h
index e452d5f0920e9..30df01caed6cf 100644
--- a/clang/lib/Headers/avxifmaintrin.h
+++ b/clang/lib/Headers/avxifmaintrin.h
@@ -17,11 +17,11 @@
 /* Define the default attributes for the functions in this file. */
 #if defined(__cplusplus) && (__cplusplus >= 201103L)
 #define __DEFAULT_FN_ATTRS128                                                  \
-  constexpr __attribute__((__always_inline__, __nodebug__,                     \
-                           __target__("avxifma"), __min_vector_width__(128)))
+  __attribute__((__always_inline__, __nodebug__, __target__("avxifma"),        \
+                 __min_vector_width__(128))) constexpr
 #define __DEFAULT_FN_ATTRS256                                                  \
-  constexpr __attribute__((__always_inline__, __nodebug__,                     \
-                           __target__("avxifma"), __min_vector_width__(256)))
+  __attribute__((__always_inline__, __nodebug__, __target__("avxifma"),        \
+                 __min_vector_width__(256))) constexpr
 #else
 #define __DEFAULT_FN_ATTRS128                                                  \
   __attribute__((__always_inline__, __nodebug__, __target__("avxifma"),        \