Revert "Make serial parallel_for "polyfill" iterate backwards in debug builds (#9044)"

This reverts commit 8f7bc8d.

ghstack-source-id: 83550a9
ghstack-comment-id: 2718557697
Pull Request resolved: #9188

Author: swolchok

runtime/kernel/targets.bzl

@@ -56,7 +56,6 @@ def define_common_targets():
         exported_headers = ["thread_parallel_interface.h"],
         exported_deps = [
             "//executorch/runtime/core:core",
-            "//executorch/runtime/core/portable_type/c10/c10:c10",
             "//executorch/runtime/platform:platform",
         ],
         visibility = [

runtime/kernel/thread_parallel_interface.h

@@ -11,7 +11,6 @@
 #include <cstdint>
 #include <functional>
 
-#include <c10/util/irange.h>
 #include <executorch/runtime/core/error.h>
 #include <executorch/runtime/platform/assert.h>
 
@@ -30,17 +29,7 @@ inline bool parallel_for_no_threadpool(
       begin,
       end);
   ET_CHECK_OR_RETURN_FALSE(grain_size > 0, "grain_size = %" PRId64, grain_size);
-#ifndef NDEBUG
-  // Go backwards through the range elementwise to catch code that
-  // assumes parallel_for is in order like a regular for loop.
-  for (const auto i : c10::irange(begin, end)) {
-    const auto offset = i - begin;
-    const auto idx = end - offset - 1;
-    f(idx, idx + 1);
-  }
-#else // NDEBUG
   f(begin, end);
-#endif
   return true;
 }