chore: callgrind

Justfile

@@ -29,3 +29,8 @@
 [no-exit-message]
 @evalp expr:
   cargo run --release --features prof -- eval --expr '{{expr}}'
+
+[no-exit-message]
+[positional-arguments]
+@cg *args='':
+  valgrind --tool=callgrind --dump-instr=yes --collect-jumps=yes "$@"