[Bug c/67925] docs lie about being unable to inline function call before definition

["arkadiusz at drabczyk dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67925

--- Comment #6 from Arkadiusz Drabczyk <arkadiusz at drabczyk dot org> ---
Sorry, this code is wrong of course, value returned by factorial() must be used
to generate an actual code:

$ cat bug1.c
#include <stdio.h>
#include <stdlib.h>

inline static int factorial(unsigned int i)
{
   if(i <= 1)
   {
      return 1;
   }
   return i * factorial(i - 1);
}

int main(void)
{
        printf("%d\n", factorial(12));
        exit(0);
}
$ cat bug1.s
        .file   "bug1.c"
        .section        .rodata.str1.1,"aMS",@progbits,1
.LC0:
        .string "%d\n"
        .section        .text.startup,"ax",@progbits
        .p2align 4,,15
        .globl  main
        .type   main, @function
main:
.LFB22:
        .cfi_startproc
        subq    $8, %rsp
        .cfi_def_cfa_offset 16
        movl    $1, %esi
        movl    $12, %eax
        .p2align 4,,10
        .p2align 3
.L2:
        imull   %eax, %esi
        subl    $1, %eax
        cmpl    $1, %eax
        jne     .L2
        movl    $.LC0, %edi
        xorl    %eax, %eax
        call    printf
        xorl    %edi, %edi
        call    exit
        .cfi_endproc
.LFE22:
        .size   main, .-main
        .ident  "GCC: (GNU) 6.0.0 20151004 (experimental)"
        .section        .note.GNU-stack,"",@progbits