objtool,x86: Replace alternatives with .retpoline_sites
Instead of writing complete alternatives, simply provide a list of all the retpoline thunk calls. Then the kernel is free to do with them as it pleases. Simpler code all-round. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: NBorislav Petkov <bp@suse.de> Acked-by: NJosh Poimboeuf <jpoimboe@redhat.com> Tested-by: NAlexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/r/20211026120309.850007165@infradead.org
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