add ABI stable method for updating constant buffer

torch/_inductor/codegen/aoti_runtime/interface.cpp

@@ -249,6 +249,26 @@ AOTIRuntimeError AOTInductorModelContainerUpdateUserManagedConstantBuffer(
   })
 }
 
+AOTIRuntimeError AOTInductorModelContainerUpdateUserManagedConstantBufferPairs(
+    AOTInductorModelContainerHandle container_handle,
+    const AOTInductorConstantMapEntry* pairs,
+    size_t num_pairs,
+    bool use_inactive,
+    bool validate_full_update) {
+  auto* container =
+      reinterpret_cast<torch::aot_inductor::AOTInductorModelContainer*>(container_handle);
+  // Build a local unordered_map inside
+  std::unordered_map<std::string, AtenTensorHandle> input_map;
+  input_map.reserve(num_pairs);
+  for (size_t i = 0; i < num_pairs; ++i) {
+      input_map.emplace(pairs[i].name, pairs[i].handle);
+  }
+  CONVERT_EXCEPTION_TO_ERROR_CODE({
+    container->update_constant_buffer(
+        input_map, use_inactive, validate_full_update, /*user_managed=*/true);
+  })
+}
+
 AOTIRuntimeError AOTInductorModelContainerUpdateConstantBuffer(
     AOTInductorModelContainerHandle container_handle,
     AOTInductorConstantMapHandle constant_map_handle,

torch/csrc/inductor/aoti_runtime/interface.h

@@ -30,6 +30,11 @@ using AOTInductorStreamHandle = AOTInductorStreamOpaque*;
 struct AOTInductorConstantMap;
 using AOTInductorConstantMapHandle = AOTInductorConstantMap*;
 
+struct AOTInductorConstantMapEntry {
+  const char* name;
+  AtenTensorHandle handle;
+};
+
 // TODO: Deprecate this API. This was kept for BC compatibility.
 // Please use AOTInductorModelContainerCreateWithDevice instead.
 AOTI_API AOTIRuntimeError AOTInductorModelContainerCreate(
@@ -151,6 +156,16 @@ AOTInductorModelContainerUpdateUserManagedConstantBuffer(
     bool use_inactive,
     bool validate_full_update);
 
+// Same as AOTInductorModelContainerUpdateUserManagedConstantBuffer,
+// but no std::unordered_map crosses DLL boundaries for cross-compilation.
+AOTI_API AOTIRuntimeError
+AOTInductorModelContainerUpdateUserManagedConstantBufferPairs(
+    AOTInductorModelContainerHandle container_handle,
+    const AOTInductorConstantMapEntry* pairs,
+    size_t num_pairs,
+    bool use_inactive,
+    bool validate_full_update);
+
 // Setup the constant buffer in model container with provided ConstantMap
 // use_inactive should be set as true if the inactive buffer is to be updated.
 // validate_full_update checks if all constants are included in the ConstantMap