A couple of small improvements to ra_prof printing
A couple of small improvements to ra_prof printing

Based on suggestions from @matklad.

Signed-off-by: Michal Terepeta <369df49275e5bc251c4c73f6250cec386e4069c3@gmail.com>

rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer