[Bug ld/28124] ld: Make special sections in a section group GCable

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=28124

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
For SHF_LINK_ORDER:

% cat a.s
.globl _start; _start: nop
.section .text.a,"ax",@progbits; ret
.section .init_array.a,"awo",@init_array,.text.a; ret
% gcc -fuse-ld=bfd a.s -nostdlib -Wl,--gc-sections
/usr/bin/ld.bfd: a.out: sh_link of section `.init_array' points to discarded
section `.text.a' of `/tmp/cceqfqVM.o'
/usr/bin/ld.bfd: final link failed: bad value
collect2: error: ld returned 1 exit status

(Trunk GNU ld is the same.)

If we allow GCable .init_array, we should discard .init_array.a and this should
link without an error.

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