xtask/profiler: Improved the userspace profiling by dynamically switching programs

This now works really nicely, just a few improvements to performance,
but other than that, this is so good.

Signed-off-by: Amjad Alsharafi <[email protected]>

Author: Amjad50

Cargo.lock

@@ -14,3 +14,5 @@ qapi = { version = "0.15", features = ["qapi-qmp", "qapi-qga"] }
 framehop = "0.14"
 elf = "0.8"
 rustc-demangle = "0.1"
+xxhash-rust = { version = "0.8", features = ["xxh3"] }
+

xtask/Cargo.toml

@@ -166,10 +166,6 @@ pub struct Profiler {
     #[argh(description = "collect a single stack trace and exit")]
     pub one_shot: bool,
 
-    #[argh(option, long = "user-program", short = 'u')]
-    #[argh(description = "userspace program that you want to profile (not accurate for now...)")]
-    pub user_program: Option<String>,
-
     #[argh(option, long = "profile", short = 'p')]
     #[argh(
         description = "by default we will check for `--profile` runs, but if you want to profile `release` or `debug`, put it here"