objtool/klp: Add test for sympos resolved against a linked vmlinux

vmlinux is not like a module: the final link reorders sub-sections, so a
symbol's position has to come from the linked image rather than from symbol
table order.  klp diff bridges that with .klp.symid, and looks for it only
when the object it was handed is called vmlinux.o with a vmlinux beside it.

This was assigned to an end-to-end test on the assumption that it needs a
real kernel build.  It needs "ld -r" and "ld -e 0", and takes a fraction of
a second.

The fixture places the static appearing first in the symbol table at the
higher address, and the link passes --sort-section=name to force the
reordering the kernel's linker script performs.  Without that the two ways
of computing sympos agree, and a first version passed with the vmlinux path
disabled.

Assisted-by: Claude:claude-opus-4
Based-on-test-by: Joe Lawrence <joe.lawrence@redhat.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20260916184351.2720310-39-song@kernel.org

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