Adding iree_runtime_session_trim helper.
This just signals IREE_VM_SIGNAL_LOW_MEMORY on the context.

iree/runtime/session.c

diff --git a/iree/runtime/session.c b/iree/runtime/session.c
index 8704654..8128879 100644
--- a/iree/runtime/session.c
+++ b/iree/runtime/session.c
@@ -171,6 +171,16 @@
   return iree_hal_device_allocator(device);
 }
 
+IREE_API_EXPORT iree_status_t
+iree_runtime_session_trim(iree_runtime_session_t* session) {
+  IREE_ASSERT_ARGUMENT(session);
+  IREE_TRACE_ZONE_BEGIN(z0);
+  iree_status_t status = iree_vm_context_notify(
+      iree_runtime_session_context(session), IREE_VM_SIGNAL_LOW_MEMORY);
+  IREE_TRACE_ZONE_END(z0);
+  return status;
+}
+
 IREE_API_EXPORT iree_status_t iree_runtime_session_append_module(
     iree_runtime_session_t* session, iree_vm_module_t* module) {
   IREE_ASSERT_ARGUMENT(session);

iree/runtime/session.h

diff --git a/iree/runtime/session.h b/iree/runtime/session.h
index 960d7fb..ec0500c 100644
--- a/iree/runtime/session.h
+++ b/iree/runtime/session.h
@@ -128,6 +128,13 @@
 IREE_API_EXPORT iree_hal_allocator_t* iree_runtime_session_device_allocator(
     const iree_runtime_session_t* session);
 
+// Trims transient/cached resources used by the session.
+// Upon resuming these resources may be expensive to rematerialize/reload and
+// as such this should only be called when it is known the resources will not
+// be needed soon.
+IREE_API_EXPORT iree_status_t
+iree_runtime_session_trim(iree_runtime_session_t* session);
+
 // Appends the given |module| to the context.
 // The module will be retained by the context.
 //