Update on "[Executorch] optimized sigmoid"

basically use exp approximation using sleef instead of std::exp

Differential Revision: [D64156864](https://our.internmc.facebook.com/intern/diff/D64156864/)

[ghstack-poisoned]

Author: kimishpatel

shim/xplat/executorch/kernels/optimized/lib_defs.bzl

@@ -16,16 +16,46 @@ load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "runtime")
 # functions in order to declare the required compiler flags needed in order to
 # access CPU vector intrinsics.
 
-def get_vec_android_preprocessor_flags():
-    preprocessor_flags = [
-        (
-            "^android-arm64.*$",
-            [
+# This oopy from kernels/optimized/lib_defs.bzl is not necessary.
+# This file really needs to be removed
+def get_vec_preprocessor_flags():
+    if not runtime.is_oss:
+        # various ovr_configs are not available in oss
+        preprocessor_flags = select({
+            "ovr_config//os:iphoneos": [
                 "-DET_BUILD_ARM_VEC256_WITH_SLEEF",
-            ],
-        ),
-    ]
-    return preprocessor_flags
+            ] if not runtime.is_oss else [],
+            "ovr_config//os:macos-arm64": [
+                "-DET_BUILD_ARM_VEC256_WITH_SLEEF",
+            ] if not runtime.is_oss else [],
+            "ovr_config//os:android-arm64": [
+                "-DET_BUILD_ARM_VEC256_WITH_SLEEF",
+            ] if not runtime.is_oss else [],
+            "DEFAULT": [],
+        })
+        return preprocessor_flags
+    return []
+
+def get_vec_deps():
+    if not runtime.is_oss:
+        # various ovr_configs are not available in oss
+        deps = select({
+            "ovr_config//os:linux-x86_64": [
+                "fbsource//third-party/sleef:sleef",
+            ] if not runtime.is_oss else [],
+            "ovr_config//os:iphoneos": [
+                "fbsource//third-party/sleef:sleef_arm",
+            ] if not runtime.is_oss else [],
+            "ovr_config//os:macos-arm64": [
+                "fbsource//third-party/sleef:sleef_arm",
+            ] if not runtime.is_oss else [],
+            "ovr_config//os:android-arm64": [
+                "fbsource//third-party/sleef:sleef_arm",
+            ] if not runtime.is_oss else [],
+            "DEFAULT": [],
+        })
+        return deps
+    return []
 
 def get_vec_cxx_preprocessor_flags():
     preprocessor_flags = [