Revert "perf: Avoid the read if the count is already updated"

This reverts commit 948664b9 which is
commit 8ce939a0 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I3554a243dacf11dd19e3e0b1f44c71dfe103e69a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>