get functions to use a new register assignment, since they get new registers now

anonymous-function-test.ar

@@ -1,3 +1,4 @@
-let f(i) = do
-  while (i) i=i-1
-f(1e6)
+let i = 1000000
+while (i) do
+  i=i-1
+term.log(add)

app.py

@@ -1,4 +1,4 @@
-i = 10000000
+i = 1_000_000
 while i:
     print(i)
     i=i-1

src/translator/function/function.c

@@ -14,6 +14,8 @@
 size_t translate_parsed_function(Translated *translated,
                                  ParsedFunction *parsedFunction, ArErr *err) {
   DArray main_bytecode = translated->bytecode;
+  uint8_t old_assignment = translated->registerAssignment;
+  translated->registerAssignment = 1;
   darray_init(&translated->bytecode, sizeof(uint8_t));
   set_registers(translated, 1);
   translate_parsed(translated, parsedFunction->body, err);
@@ -23,6 +25,7 @@ size_t translate_parsed_function(Translated *translated,
   size_t function_bytecode_length = translated->bytecode.size;
   darray_free(&translated->bytecode, NULL);
   translated->bytecode = main_bytecode;
+  translated->registerAssignment = old_assignment;
   size_t start = push_instruction_byte(translated, OP_LOAD_FUNCTION);
   size_t offset = arena_push(&translated->constants, parsedFunction->name,
                              strlen(parsedFunction->name));