UPSTREAM: kcov: don't profile branches in kcov

UPSTREAM: kcov: don't profile branches in kcov

Profiling 'if' statements in __sanitizer_cov_trace_pc() leads to
unbound recursion and crash:

	__sanitizer_cov_trace_pc() ->
		ftrace_likely_update ->
			__sanitizer_cov_trace_pc() ...

Define DISABLE_BRANCH_PROFILING to disable this tracer.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Bug: 64145065
(cherry-picked from 36f05ae8bce904b4c8105363e6227a79d343bda6)
Change-Id: I53cea027ba86b89016df3944374bdb119a2ca9dd
Signed-off-by: Paul Lawrence <paullawrence@google.com>