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

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

Allows clang-format to pack the attributes more efficiently

Author: RKSimon

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"),     \

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__))

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"),        \