context.allocator = a; Remove __ from runtime procs; improve division for complex numbers

core/mem/alloc.odin

@@ -110,10 +110,7 @@ make_dynamic_array_len_cap :: proc($T: typeid/[dynamic]$E, auto_cast len: int, a
 }
 make_map :: proc($T: typeid/map[$K]$E, auto_cast cap: int = 16, allocator := context.allocator, loc := #caller_location) -> T {
 	runtime.make_map_expr_error_loc(loc, cap);
-
-	c := context;
-	c.allocator = allocator;
-	context = c;
+	context.allocator = allocator;
 
 	m: T;
 	reserve_map(&m, cap);

core/mem/mem.odin

@@ -213,14 +213,13 @@ init_arena_from_context :: proc(using a: ^Arena, size: int) {
 
 
 context_from_allocator :: proc(a: Allocator) -> type_of(context) {
-	c := context;
-	c.allocator = a;
-	return c;
+	context.allocator = a;
+	return context;
 }
 
 destroy_arena :: proc(using a: ^Arena) {
 	if backing.procedure != nil {
-		context = context_from_allocator(backing);
+		context.allocator = backing;
 		if memory != nil {
 			free(&memory[0]);
 		}