refactor(timings): remove unused rmeta_time

This can be derived from sections.

Author: weihanglo

src/cargo/core/compiler/timings/mod.rs

@@ -132,7 +132,6 @@ struct UnitData {
     target: String,
     start: f64,
     duration: f64,
-    rmeta_time: Option<f64>,
     unblocked_units: Vec<usize>,
     unblocked_rmeta_units: Vec<usize>,
     sections: Option<Vec<(report::SectionName, report::SectionData)>>,

src/cargo/core/compiler/timings/report.rs

@@ -396,7 +396,6 @@ fn to_unit_data(unit_times: &[UnitTime]) -> Vec<UnitData> {
                 target: ut.target.clone(),
                 start: round(ut.start),
                 duration: round(ut.duration),
-                rmeta_time: ut.rmeta_time.map(round),
                 unblocked_units,
                 unblocked_rmeta_units,
                 sections,

src/cargo/core/compiler/timings/timings.js

@@ -150,14 +150,7 @@ function render_pipeline_graph() {
             });
         }
     }
-    else if (unit.rmeta_time != null) {
-        // We only know the rmeta time
-        sections.push({
-            name: "codegen",
-            start: x + px_per_sec * unit.rmeta_time,
-            width: (unit.duration - unit.rmeta_time) * px_per_sec
-        });
-    }
+
     let width = Math.max(px_per_sec * unit.duration, 1.0);
     UNIT_COORDS[unit.i] = {x, y, width, sections};