Begin work on Atomics for wasm32 (wait and notify intrinsics)

core/sync/primitives_wasm.odin

@@ -0,0 +1,8 @@
+//+private
+//+build wasm32
+package sync
+
+_current_thread_id :: proc "contextless" () -> int {
+	// TODO(bill): _current_thread_id for wasm32
+	return 0
+}