objtool changes for v5.10:

 - Most of the changes are cleanups and reorganization to make the objtool code
   more arch-agnostic. This is in preparation for non-x86 support.

Fixes:

 - KASAN fixes.
 - Handle unreachable trap after call to noreturn functions better.
 - Ignore unreachable fake jumps.
 - Misc smaller fixes & cleanups.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
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