add cpuprofile to ra_prof

Now, one can use `let _p = ra_prof::cpu_profiler()` to capture profile
of a block of code.

This is not an out of the box experience, as that relies on gperfools

See the docs on https://github.com/AtheMathmo/cpuprofiler for more!

1 files changed, 1 insertions, 0 deletions

diff --git a/crates/ra_prof/Cargo.toml b/crates/ra_prof/Cargo.toml
index d55af18f5..787e18385 100644
--- a/crates/ra_prof/Cargo.toml
+++ b/crates/ra_prof/Cargo.toml
@@ -9,3 +9,4 @@ publish = false
 once_cell = "0.2.0"
 itertools = "0.8.0"
 backtrace = "0.3.28"
+cpuprofiler = { version = "0.0.3", optional = true }