perf/core: Change the layout of perf_sample_data

perf/core: Change the layout of perf_sample_data

The layout of perf_sample_data is designed to minimize cache-line
access.  The perf_sample_data_init() used to initialize a couple of
fields unconditionally so they were placed together at the head.

But it's changed now to set the fields according to the actual
sample_type flags.  The main user (the perf tools) sets the IP, TID,
TIME, PERIOD always.  Also group relevant fields like addr, phys_addr
and data_page_size.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20221229204101.1099430-1-namhyung@kernel.org