ld(1): Correctly define .init_array and .fini_array for all platforms.

[zlei]

Summary

The constructor and destructor section names can have a priority
suffixed, as a decimal number.

Unless the ldscript is instructed to sort these sections
into a single one, this feature does not work as expected.

MFC after: 1 week
Sponsored by: NVIDIA Networking

[• hselasky]

@emaste : You added something similar a while back for amd64. Adding you for review.

[arichardson]

This will sort by name not priority. Ld.lld will sort by priority automatically if you omit init_array from the linker script but for bfd you need SORT_BY_INIT_PRIORITY

[emaste]

Looks like these are in amd64 via rG:8ba66bb849129

[• hselasky]

@arichardson : Use SORT_BY_INIT_PRIORITY()

Should .ctors and .dtors use the same?

[zlei]

Split the FIX for sorting input sections to D45194 .

[zlei]

I tried to Update Diff but failed. Split the definition for other platforms to D45214 .

[zlei]

Landed as e15b5ba77d69 and 3e76d05231b0 .