[Bug ld/26256] Support mixed SHF_LINK_ORDER & non-SHF_LINK_ORDER components in an output section

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26256

--- Comment #2 from Fangrui Song <i at maskray dot me> ---
There is a related issue.

>a.s<<e cat
 .global _start
 _start:

 .section .text.bar,"a",@progbits
 .byte 2
 .section .text.foo,"a",@progbits
 .byte 1
 .section .ro.foo,"ao",@progbits,.text.foo
 .byte 1
 .section .ro.bar,"ao",@progbits,.text.bar
 .byte 2
e
>a.lds echo 'SECTIONS { .ro : {*(.ro.bar) *(.ro.foo)} .text : {*(.text.foo) 
>*(.text.bar)} }'
as a.s -o a.o       # >=2.35
ld.bfd -T a.lds a.o -o a
readelf -W -x .text -x .ro a

Hex dump of section '.ro':
  0x00000000 0102                                ..

Hex dump of section '.text':
  0x00000038 0102                                ..

However, I don't expect ld to reorder .ro.foo before .ro.bar because
*(.ro.bar) *(.ro.foo) clearly expresses an order.

The current asection::map_header.link_order representation does not take into
account different input section descriptions.

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