Try harder to find the true path of a method

Particularly on Julia binaries, the path may need correction.
Tests are in Revise.

Author: timholy

src/CodeTracking.jl

@@ -30,6 +30,13 @@ is the first line of the method's body.
 """
 function whereis(method::Method)
     lin = get(method_info, method.sig, nothing)
+    if lin === nothing
+        f = method_lookup_callback[]
+        if f !== nothing
+            Base.invokelatest(f, method)
+        end
+        lin = get(method_info, method.sig, nothing)
+    end
     if lin === nothing
         file, line = String(method.file), method.line
     else