objtool: Correctly handle retpoline thunk calls
Just like JMP handling, convert a direct CALL to a retpoline thunk into a retpoline safe indirect CALL. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NBorislav Petkov <bp@suse.de> Signed-off-by: NIngo Molnar <mingo@kernel.org> Reviewed-by: NMiroslav Benes <mbenes@suse.cz> Link: https://lkml.kernel.org/r/20210326151259.567568238@infradead.org
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