Fix dependency on filesystem on Linux (pytorch#137209)

Similar to: pytorch#134494
We are seeing come back of pytorch#133437 due to use of filesystem on Linux

Pull Request resolved: pytorch#137209
Approved by: https://github.com/kit1980, https://github.com/malfet

torch/csrc/inductor/aoti_torch/shim_common.cpp

@@ -56,22 +56,30 @@ namespace fs = std::experimental::filesystem;
 #endif
 
 #ifndef _WIN32
+#include <limits.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
 #endif
 
 // HACK for failed builds in ARVR, where it cannot find these symbols within
 // std::experimental::filesystem
 namespace {
-fs::path get_current_path() {
-#if __has_include("filesystem")
-  return fs::current_path();
+std::string get_current_path() {
+#if __has_include("filesystem") && !defined(__linux__)
+  return fs::current_path().string();
 #else
-  throw std::runtime_error("Not implemented");
+  char currentPath[PATH_MAX];
+  if (getcwd(currentPath, sizeof(currentPath)) != nullptr) {
+    return std::string(currentPath);
+  } else {
+    throw std::runtime_error("Failed to get current path");
+  }
 #endif
 }
 
 bool file_exists(std::string& path) {
-#ifdef _WIN32
+#if __has_include("filesystem") && !defined(__linux__)
   return fs::exists(path);
 #else
   struct stat rc;
@@ -80,10 +88,13 @@ bool file_exists(std::string& path) {
 }
 
 bool create_directories(const std::string& path) {
-#if __has_include("filesystem")
+#if __has_include("filesystem") && !defined(__linux__)
   return fs::create_directories(path);
 #else
-  throw std::runtime_error("Not implemented");
+  if (mkdir(path.c_str(), 0777) == -1) {
+    throw std::runtime_error("Failed to create directory");
+  }
+  return true;
 #endif
 }
 } // namespace
@@ -1039,7 +1050,7 @@ AOTI_TORCH_EXPORT void aoti_torch_save_tensor_handle(
   at::Tensor* t = tensor_handle_to_tensor_pointer(self);
 #ifndef C10_MOBILE
   // Save tensor to tmp .pt file for tensors and can be torch.load'ed later
-  std::string cwd = get_current_path().string();
+  std::string cwd = get_current_path();
   std::string tmp_folder = cwd + "/tmp/aoti_torch/";
   if (!file_exists(tmp_folder)) {
     std::cout