saveargs: Implement as libsaveargs

*** 62,71 ****
--- 62,82 ----
  movq    %rsi,-0x10(%rbp)
  movq    %rdi,-0x8(%rbp)
  subq    $0x50,%rsp
  SET_SIZE(gcc_mov_basic, gcc_mov_basic_end)
  
+ FUNC(gcc_mov_noorder)
+ pushq   %rbp
+ movq    %rsp, %rbp
+ movq    %rcx,-0x20(%rbp)
+ movq    %rbx,-0x28(%rbp)
+ movq    %rdi,-0x8(%rbp)
+ movq    %rdx,-0x18(%rbp)
+ movq    %rsi,-0x10(%rbp)
+ subq    $0x50,%rsp
+ SET_SIZE(gcc_mov_noorder, gcc_mov_noorder_end)
+         
  FUNC(gcc_mov_big_struct_ret)
  pushq   %rbp
  movq    %rsp,%rbp
  movq    %rbx,-0x28(%rbp)
  movq    %r8,-0x20(%rbp)
*** 73,82 ****
--- 84,104 ----
  movq    %rdx,-0x10(%rbp)
  movq    %rsi,-0x8(%rbp)
  subq    $0x50,%rsp
  SET_SIZE(gcc_mov_big_struct_ret, gcc_mov_big_struct_ret_end)
  
+ FUNC(gcc_mov_struct_noorder)
+ pushq   %rbp
+ movq    %rsp,%rbp
+ movq    %rcx,-0x18(%rbp)
+ movq    %r8,-0x20(%rbp)
+ movq    %rsi,-0x8(%rbp)
+ movq    %rdx,-0x10(%rbp)
+ movq    %rbx,-0x28(%rbp)
+ subq    $0x50,%rsp
+ SET_SIZE(gcc_mov_struct_noorder, gcc_mov_struct_noorder_end)
+ 
  FUNC(gcc_mov_big_struct_ret_and_spill)
  pushq   %rbp
  movq    %rsp,%rbp
  movq    %rbx,-0x38(%rbp)
  movq    %r9,-0x28(%rbp)
*** 144,163 ****
--- 166,205 ----
  pushq   %rdx
  pushq   %rcx
  subq    $0x20,%rsp
  SET_SIZE(gcc_push_basic, gcc_push_basic_end)
  
+ FUNC(gcc_push_noorder)
+ pushq   %rbp
+ movq    %rsp,%rbp
+ pushq   %rsi
+ pushq   %rdi
+ pushq   %rcx
+ pushq   %rdx
+ subq    $0x20,%rsp
+ SET_SIZE(gcc_push_noorder, gcc_push_noorder_end)
+ 
  FUNC(gcc_push_big_struct_ret)
  pushq   %rbp
  movq    %rsp,%rbp
  pushq   %rsi
  pushq   %rdx
  pushq   %rcx
  pushq   %r8
  subq    $0x30,%rsp
  SET_SIZE(gcc_push_big_struct_ret, gcc_push_big_struct_ret_end)
  
+ FUNC(gcc_push_struct_noorder)
+ pushq   %rbp
+ movq    %rsp,%rbp
+ pushq   %rdx
+ pushq   %rsi
+ pushq   %r8
+ pushq   %rcx
+ subq    $0x30,%rsp
+ SET_SIZE(gcc_push_struct_noorder, gcc_push_struct_noorder_end)
+         
  FUNC(gcc_push_big_struct_ret_and_spill)
  pushq   %rbp
  movq    %rsp,%rbp
  pushq   %rsi
  pushq   %rdx
*** 392,396 ****
--- 434,454 ----
  movq    %rdx,-0x18(%rbp)
  movq    %rsi,-0x10(%rbp)
  movq    %rdi,-0x8(%rbp)
  subq    $0x50,%rsp
  SET_SIZE(small_struct_arg_by_value, small_struct_arg_by_value_end)
+ 
+ FUNC(interleaved_argument_saves)
+ pushq   %rbp
+ movq    %rdi,%rax
+ shlq    $0x21,%rax
+ movq    %rsp,%rbp
+ shrq    $0x29,%rax
+ subq    $0x30,%rsp
+ movq    %rdi,-0x8(%rbp)
+ movq    %rbx,-0x28(%rbp)
+ movzbl  %dil,%edi
+ movq    %rcx,-0x20(%rbp)
+ movq    %rdx,-0x18(%rbp)
+ movq    %rsi,-0x10(%rbp)
+ movq    0x0(,%rax,8),%rax
+ SET_SIZE(interleaved_argument_saves, interleaved_argument_saves_end)