vhost, kcov: collect coverage from vhost_worker

Add kcov_remote_start()/kcov_remote_stop() annotations to the
vhost_worker() function, which is responsible for processing vhost
works.

Since vhost_worker() threads are spawned per vhost device instance the
common kcov handle is used for kcov_remote_start()/stop() annotations
(see Documentation/dev-tools/kcov.rst for details).  As the result kcov
can now be used to collect coverage from vhost worker threads.

Link: http://lkml.kernel.org/r/e49d5d154e5da6c9ada521d2b7ce10a49ce9f98b.1572366574.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <[email protected]>
Cc: Alan Stern <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Anders Roxell <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: David Windsor <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Elena Reshetova <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Steven Rostedt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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