[mono][interp] Free headers allocated for inlined methods

We add them to a list for later freeing. This uses the same pattern as jit.

Author: BrzVlad

src/mono/mono/mini/interp/transform.c

@@ -3310,6 +3310,8 @@ interp_inline_newobj (TransformData *td, MonoMethod *target_method, MonoMethodSi
 		goto fail;
 	td->ip += 5;
 
+	td->headers_to_free = g_slist_prepend_mempool (td->mempool, td->headers_to_free, mheader);
+
 	push_var (td, dreg);
 	return TRUE;
 fail:
@@ -3911,6 +3913,7 @@ interp_transform_call (TransformData *td, MonoMethod *method, MonoMethod *target
 		return_val_if_nok (error, FALSE);
 
 		if (interp_inline_method (td, target_method, mheader, error)) {
+			td->headers_to_free = g_slist_prepend_mempool (td->mempool, td->headers_to_free, mheader);
 			td->ip += 5;
 			goto done;
 		}
@@ -9935,6 +9938,8 @@ generate (MonoMethod *method, MonoMethodHeader *header, InterpMethod *rtm, MonoG
 	if (td->line_numbers)
 		g_array_free (td->line_numbers, TRUE);
 	g_slist_free (td->imethod_items);
+	for (GSList *l = td->headers_to_free; l; l = l->next)
+		mono_metadata_free_mh ((MonoMethodHeader *)l->data);
 	mono_mempool_destroy (td->mempool);
 	mono_interp_pgo_generate_end ();
 	if (td->retry_compilation) {

src/mono/mono/mini/interp/transform.h

@@ -316,6 +316,7 @@ typedef struct
 	// FIXME: ptr_u32
 	dn_simdhash_ptr_ptr_t *data_hash;
 	GSList *imethod_items;
+	GSList *headers_to_free;
 #ifdef ENABLE_EXPERIMENT_TIERED
 	// FIXME: ptr_u32
 	dn_simdhash_ptr_ptr_t *patchsite_hash;