coverage: Remove FunctionCoverageCollector

The information that was being collected by this builder type is now collected
by the `coverage_ids_info` query instead.

compiler/rustc_codegen_llvm/src/coverageinfo/map_data.rs

@@ -3,63 +3,9 @@ use rustc_middle::mir::coverage::{
     CovTerm, CoverageIdsInfo, Expression, FunctionCoverageInfo, Mapping, MappingKind, Op,
     SourceRegion,
 };
-use rustc_middle::ty::Instance;
-use tracing::debug;
 
 use crate::coverageinfo::ffi::{Counter, CounterExpression, ExprKind};
 
-/// Holds all of the coverage mapping data associated with a function instance,
-/// collected during traversal of `Coverage` statements in the function's MIR.
-#[derive(Debug)]
-pub(crate) struct FunctionCoverageCollector<'tcx> {
-    /// Coverage info that was attached to this function by the instrumentor.
-    function_coverage_info: &'tcx FunctionCoverageInfo,
-    ids_info: &'tcx CoverageIdsInfo,
-    is_used: bool,
-}
-
-impl<'tcx> FunctionCoverageCollector<'tcx> {
-    /// Creates a new set of coverage data for a used (called) function.
-    pub(crate) fn new(
-        instance: Instance<'tcx>,
-        function_coverage_info: &'tcx FunctionCoverageInfo,
-        ids_info: &'tcx CoverageIdsInfo,
-    ) -> Self {
-        Self::create(instance, function_coverage_info, ids_info, true)
-    }
-
-    /// Creates a new set of coverage data for an unused (never called) function.
-    pub(crate) fn unused(
-        instance: Instance<'tcx>,
-        function_coverage_info: &'tcx FunctionCoverageInfo,
-        ids_info: &'tcx CoverageIdsInfo,
-    ) -> Self {
-        Self::create(instance, function_coverage_info, ids_info, false)
-    }
-
-    fn create(
-        instance: Instance<'tcx>,
-        function_coverage_info: &'tcx FunctionCoverageInfo,
-        ids_info: &'tcx CoverageIdsInfo,
-        is_used: bool,
-    ) -> Self {
-        let num_counters = function_coverage_info.num_counters;
-        let num_expressions = function_coverage_info.expressions.len();
-        debug!(
-            "FunctionCoverage::create(instance={instance:?}) has \
-            num_counters={num_counters}, num_expressions={num_expressions}, is_used={is_used}"
-        );
-
-        Self { function_coverage_info, ids_info, is_used }
-    }
-
-    pub(crate) fn into_finished(self) -> FunctionCoverage<'tcx> {
-        let FunctionCoverageCollector { function_coverage_info, ids_info, is_used, .. } = self;
-
-        FunctionCoverage { function_coverage_info, ids_info, is_used }
-    }
-}
-
 pub(crate) struct FunctionCoverage<'tcx> {
     pub(crate) function_coverage_info: &'tcx FunctionCoverageInfo,
     ids_info: &'tcx CoverageIdsInfo,
@@ -67,6 +13,20 @@ pub(crate) struct FunctionCoverage<'tcx> {
 }
 
 impl<'tcx> FunctionCoverage<'tcx> {
+    pub(crate) fn new_used(
+        function_coverage_info: &'tcx FunctionCoverageInfo,
+        ids_info: &'tcx CoverageIdsInfo,
+    ) -> Self {
+        Self { function_coverage_info, ids_info, is_used: true }
+    }
+
+    pub(crate) fn new_unused(
+        function_coverage_info: &'tcx FunctionCoverageInfo,
+        ids_info: &'tcx CoverageIdsInfo,
+    ) -> Self {
+        Self { function_coverage_info, ids_info, is_used: false }
+    }
+
     /// Returns true for a used (called) function, and false for an unused function.
     pub(crate) fn is_used(&self) -> bool {
         self.is_used