Include XOP headers in clang-cl compatible way. Fix #1382.

PiperOrigin-RevId: 366463649
diff --git a/src/qs8-vaddc/gen/minmax-xop-mul32-ld32-x24.c b/src/qs8-vaddc/gen/minmax-xop-mul32-ld32-x24.c
index c488e52..ff006d1 100644
--- a/src/qs8-vaddc/gen/minmax-xop-mul32-ld32-x24.c
+++ b/src/qs8-vaddc/gen/minmax-xop-mul32-ld32-x24.c
@@ -9,7 +9,7 @@
 
 #include <assert.h>
 
-#ifdef __GNUC__
+#if defined(__GNUC__) || defined(__clang__)
   #include <x86intrin.h>
 #else
   #include <immintrin.h>