fix: SSE only build (facebookincubator#11542)

Summary: Pull Request resolved: facebookincubator#11542

Reviewed By: parmeet

Differential Revision: D65975193

velox/common/base/SimdUtil-inl.h

@@ -1453,6 +1453,8 @@ using CharVector = xsimd::batch<uint8_t, xsimd::neon>;
 
 extern const int kPageSize;
 
+#if VELOX_SIMD_STRSTR
+
 FOLLY_ALWAYS_INLINE bool pageSafe(const void* const ptr) {
   return ((kPageSize - 1) & reinterpret_cast<std::uintptr_t>(ptr)) <=
       kPageSize - CharVector::size;
@@ -1523,6 +1525,8 @@ size_t FOLLY_ALWAYS_INLINE smidStrstrMemcmp(
   return std::string::npos;
 };
 
+#endif
+
 } // namespace detail
 
 /// A faster implementation for std::find, about 2x faster than string_view`s