* refactor external function

* wokring version

* fix bug

* add emit_fucntions, emit_declare_constants, emit_declare_functions

* add std::

* add functions declaration

* fix bugs

* fix bugs

* separate temp memory allocation and release

* add invoke_constant_ptr function, clean up outputs for function

* fix bugs, compiled ok

* add ctx to emit_declare_constant

* cleanup code, code style

* remove using std, code style

* revert std changes

* change function names based Chris's comments

* add ResultCopyElimination to pass_manager

* clang format