[PATCH 2/2] Use new symver function attribute to support LTO builds

[PATCH 2/2] Use new symver function attribute to support LTO builds

The LTO support cannot work properly when there are versioned symbols
via asm statements, as those are not seen by the compiler. Use the new
function attributes if supported instead of the asm statements.

We need to move the SYMVER calls after the function definitions
otherwise it will reference symbols not yet seen.

Signed-off-by: Guillem Jover <guillem@hadrons.org>
Gbp-Pq: Name 0002-Use-new-symver-function-attribute-to-support-LTO-bui.patch