message: Add start_of_code_block to function
diff: @@ -4724,6 +4724,12 @@ impl ModuleCodeGenerator<LLVMFunctionCodeGenerator, LLVMBackend, CodegenError>
  );
  let num_params = locals.len();
  + let start_of_code_block = self.context.append_basic_block(&function, "start_of_code");
  + let entry_end_inst = self
  + .builder
  + .build_unconditional_branch(&start_of_code_block);
  + self.builder.position_at_end(&start_of_code_block);
  +
  let code = LLVMFunctionCodeGenerator {
  state,
  builder: unsafe { ::std::mem::transmute::<&Builder, &'static Builder>(&self.builder) },
  