Amalgamate AVX, AVX2, and FMA3 microkernels

PiperOrigin-RevId: 420077368
diff --git a/tools/amalgamate-microkernels.py b/tools/amalgamate-microkernels.py
index 272cecd..23c3182 100755
--- a/tools/amalgamate-microkernels.py
+++ b/tools/amalgamate-microkernels.py
@@ -82,6 +82,7 @@
   amalgam_includes.discard("#include <emmintrin.h>")
   amalgam_includes.discard("#include <immintrin.h>")
   amalgam_includes.discard("#include <nmmintrin.h>")
+  amalgam_includes.discard("#include <smmintrin.h>")
   amalgam_includes.discard("#include <tmmintrin.h>")
   amalgam_includes.discard("#include <xmmintrin.h>")