AVX float32 sigmoid ukernels.

PiperOrigin-RevId: 337165542
diff --git a/BUILD.bazel b/BUILD.bazel
index 38beaad..ea33a2b 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -2181,6 +2181,26 @@
     "src/f32-relu/gen/avx-x16.c",
     "src/f32-relu/gen/avx-x8.c",
     "src/f32-rmax/avx.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x8.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x16.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x24.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x32.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x40.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x48.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x56.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x64.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x72.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-div-x80.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x8.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x16.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x24.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x32.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x40.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x48.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x56.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x64.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x72.c",
+    "src/f32-sigmoid/gen/avx-rr2-p5-nr2-x80.c",
     "src/f32-vbinary/gen/vadd-minmax-avx-x8.c",
     "src/f32-vbinary/gen/vadd-minmax-avx-x16.c",
     "src/f32-vbinary/gen/vaddc-minmax-avx-x8.c",
@@ -2233,6 +2253,7 @@
     "src/f32-vunary/gen/vsqr-avx-x8.c",
     "src/f32-vunary/gen/vsqr-avx-x16.c",
     "src/math/exp-avx-p5.c",
+    "src/math/sigmoid-avx-rr2-p5-nr2.c",
     "src/math/sigmoid-avx-rr2-p5-div.c",
     "src/math/sigmoid-avx-rr2-lut64-p2-div.c",
 ]