coverage: Return a nested vector from initial span extraction

This will allow the span extractor to produce multiple separate buckets,
instead of just one flat list of spans.

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -20,13 +20,16 @@ pub(super) fn extract_refined_covspans(
     basic_coverage_blocks: &CoverageGraph,
     code_mappings: &mut impl Extend<mappings::CodeMapping>,
 ) {
-    let sorted_spans =
+    let sorted_span_buckets =
         from_mir::mir_to_initial_sorted_coverage_spans(mir_body, hir_info, basic_coverage_blocks);
-    let coverage_spans = SpansRefiner::refine_sorted_spans(sorted_spans);
-    code_mappings.extend(coverage_spans.into_iter().map(|RefinedCovspan { bcb, span, .. }| {
-        // Each span produced by the generator represents an ordinary code region.
-        mappings::CodeMapping { span, bcb }
-    }));
+    for bucket in sorted_span_buckets {
+        let refined_spans = SpansRefiner::refine_sorted_spans(bucket);
+        code_mappings.extend(refined_spans.into_iter().map(|covspan| {
+            let RefinedCovspan { span, bcb, is_hole: _ } = covspan;
+            // Each span produced by the refiner represents an ordinary code region.
+            mappings::CodeMapping { span, bcb }
+        }));
+    }
 }
 
 #[derive(Debug)]

compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs

@@ -23,7 +23,7 @@ pub(super) fn mir_to_initial_sorted_coverage_spans(
     mir_body: &mir::Body<'_>,
     hir_info: &ExtractedHirInfo,
     basic_coverage_blocks: &CoverageGraph,
-) -> Vec<SpanFromMir> {
+) -> Vec<Vec<SpanFromMir>> {
     let &ExtractedHirInfo { body_span, .. } = hir_info;
 
     let mut initial_spans = vec![];
@@ -67,7 +67,7 @@ pub(super) fn mir_to_initial_sorted_coverage_spans(
     // requires a lot more complexity in the span refiner, for little benefit.)
     initial_spans.dedup_by(|b, a| a.span.source_equal(b.span));
 
-    initial_spans
+    vec![initial_spans]
 }
 
 /// Macros that expand into branches (e.g. `assert!`, `trace!`) tend to generate