Various kprobes updates, mostly centered around cleaning up the no-instrumentation

logic, instead of the current per debug facility blacklist, use the more generic
.noinstr.text approach, combined with a 'noinstr' marker for functions.

Also add instrumentation_begin()/end() to better manage the exact place in entry
code where instrumentation may be used.

Also add a kprobes blacklist for modules.

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