We don't want compiler instrumentation to touch noinstr functions,
which are annotated with the no_profile_instrument_function function
attribute. Add a Kconfig test for this and make GCOV depend on it, and
in the future, PGO.

If an architecture is using noinstr, it should denote that via this
Kconfig value. That makes Kconfigs that depend on noinstr able to express
dependencies in an architecturally agnostic way.

Cc: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/lkml/YMTn9yjuemKFLbws@hirez.programming.kicks-ass.net/
Link: https://lore.kernel.org/lkml/YMcssV%2Fn5IBGv4f0@hirez.programming.kicks-ass.net/Suggested-by: NNathan Chancellor <nathan@kernel.org>
Suggested-by: NPeter Zijlstra <peterz@infradead.org>
Signed-off-by: NNick Desaulniers <ndesaulniers@google.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: NNathan Chancellor <nathan@kernel.org>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Acked-by: NHeiko Carstens <hca@linux.ibm.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NKees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210621231822.2848305-4-ndesaulniers@google.com