Polyfill missing intrinsics for legacy compilers

PiperOrigin-RevId: 338496110
diff --git a/src/f32-sigmoid/gen/avx512f-rr2-lut32-p2-perm2-scalef-div-x64.c b/src/f32-sigmoid/gen/avx512f-rr2-lut32-p2-perm2-scalef-div-x64.c
index b8f96e0..9b67898 100644
--- a/src/f32-sigmoid/gen/avx512f-rr2-lut32-p2-perm2-scalef-div-x64.c
+++ b/src/f32-sigmoid/gen/avx512f-rr2-lut32-p2-perm2-scalef-div-x64.c
@@ -12,6 +12,7 @@
 #include <immintrin.h>
 
 #include <xnnpack/common.h>
+#include <xnnpack/intrinsics-polyfill.h>
 #include <xnnpack/vunary.h>