Better record locations of executed steps

Before it would just show the `ensure` function

Author: Kobzol

src/bootstrap/src/core/builder/mod.rs

@@ -1598,7 +1598,8 @@ Alternatively, you can set `build.local-rebuild=true` and use a stage0 compiler
                     // in the step_name field.
                     "step",
                     step_name = pretty_step_name::<S>(),
-                    args = step_debug_args(&step)
+                    args = step_debug_args(&step),
+                    location = crate::utils::tracing::format_location(*std::panic::Location::caller())
                 );
                 span.entered()
             };

src/bootstrap/src/utils/tracing.rs

@@ -351,7 +351,7 @@ mod inner {
                         let field = &values.fields[0];
                         write!(writer, " {{{}}}", field.1)?;
                     }
-                    write_location(writer, span.metadata())?;
+                    write_with_location(writer)?;
                 }
                 // Executed command
                 COMMAND_SPAN_TARGET => {