K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2021-12-25T12:03:24.848863Z
K 7
svn:log
V 844
compiler-rt: add aarch64 init function for LSE atomics

As reported by Ronald, adding the out-of-line LSE atomics helpers for
aarch64 to compiler-rt was not sufficient to link programs using these,
as they also require a __aarch64_have_lse_atomics global. This is
initialized in compiler-rt's lib/builtins/cpu_model.c, roughly similar
to the x86 CPU model and feature detection in that file.

Since upstream does not yet have a FreeBSD specific implementation for
getting the required information, add a simple one that should work for
now, while I try to get it sorted with the LLVM people.

Reported by:	Ronald Klop <ronald-lists@klop.ws>
Fixes:		cc55ee8009a5
PR:		257392
MFC after:	2 weeks

(cherry picked from commit efe67f33c322265eb303ec0ab40275100795b22a)

Git Hash:   f379ad3de40c781c9fbb4cf840a9a4b53d9b5254
Git Author: dim@FreeBSD.org
END