Support vtune profiling of trampolines too (#3687)

* Provide helpers for demangling function names

* Profile trampolines in vtune too

* get rid of mapping

* avoid code duplication with jitdump_linux

* maintain previous default display name for wasm functions

* no dash, grrr

* Remove unused profiling error type

crates/jit/src/demangling.rs

@@ -0,0 +1,27 @@
+//! Helpers for demangling function names.
+
+/// Demangles a single function name into a user-readable form.
+///
+/// Currently supported: Rust/C/C++ function names.
+pub fn demangle_function_name(writer: &mut impl std::fmt::Write, name: &str) -> std::fmt::Result {
+    if let Ok(demangled) = rustc_demangle::try_demangle(name) {
+        write!(writer, "{}", demangled)
+    } else if let Ok(demangled) = cpp_demangle::Symbol::new(name) {
+        write!(writer, "{}", demangled)
+    } else {
+        write!(writer, "{}", name)
+    }
+}
+
+/// Demangles a function name if it's provided, or returns a unified representation based on the
+/// function index otherwise.
+pub fn demangle_function_name_or_index(
+    writer: &mut impl std::fmt::Write,
+    name: Option<&str>,
+    func_id: usize,
+) -> std::fmt::Result {
+    match name {
+        Some(name) => demangle_function_name(writer, name),
+        None => write!(writer, "<wasm function {}>", func_id),
+    }
+}