[Bug middle-end/88345] -Os overrides -falign-functions=N on the command line

["mark at kernel dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88345

--- Comment #11 from Mark Rutland <mark at kernel dot org> ---
Further, at `-O1` and above GCC seems to silently drop the alignment of any
implementation of abort(), apparently implicitly marking it as cold.

I assume that may be true for other special functions.

For example:

[mark@lakrids:/mnt/data/tests/gcc-alignment]% cat abort.c 
void abort(void)
{
        __builtin_trap();
}
[mark@lakrids:/mnt/data/tests/gcc-alignment]% usekorg 12.1.0 aarch64-linux-gcc
-falign-functions=16 -c abort.c -O2
[mark@lakrids:/mnt/data/tests/gcc-alignment]% usekorg 12.1.0
aarch64-linux-objdump -d abort.o                     

abort.o:     file format elf64-littleaarch64


Disassembly of section .text.unlikely:

0000000000000000 <abort>:
   0:   d4207d00        brk     #0x3e8
[mark@lakrids:/mnt/data/tests/gcc-alignment]% usekorg 12.1.0
aarch64-linux-objdump -h abort.o

abort.o:     file format elf64-littleaarch64

Sections:
Idx Name          Size      VMA               LMA               File off  Algn
  0 .text         00000000  0000000000000000  0000000000000000  00000040  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .data         00000000  0000000000000000  0000000000000000  00000040  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00000000  0000000000000000  0000000000000000  00000040  2**0
                  ALLOC
  3 .text.unlikely 00000004  0000000000000000  0000000000000000  00000040  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  4 .comment      00000013  0000000000000000  0000000000000000  00000044  2**0
                  CONTENTS, READONLY
  5 .note.GNU-stack 00000000  0000000000000000  0000000000000000  00000057 
2**0
                  CONTENTS, READONLY
  6 .eh_frame     00000028  0000000000000000  0000000000000000  00000058  2**3
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA