coverage: Avoid a query stability hazard in `function_coverage_map`

When #118865 started enforcing the `rustc::potential_query_instability` lint in
`rustc_codegen_llvm`, it added an exemption for this site, arguing that the
entries are only used to create a list of filenames that is later sorted.

However, the list of entries also gets traversed when creating the function
coverage records in LLVM IR, which may be sensitive to hash-based ordering.

This patch therefore changes `function_coverage_map` to use `FxIndexMap`, which
should avoid hash-based instability by iterating in insertion order.

1 files changed, 4 insertions, 4 deletions

diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs
index 0befbb5a39b..733a77d24c2 100644
--- a/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs
@@ -10,7 +10,7 @@ use rustc_codegen_ssa::traits::{
     BaseTypeMethods, BuilderMethods, ConstMethods, CoverageInfoBuilderMethods, MiscMethods,
     StaticMethods,
 };
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
 use rustc_llvm::RustString;
 use rustc_middle::bug;
 use rustc_middle::mir::coverage::CoverageKind;
@@ -30,7 +30,7 @@ const VAR_ALIGN_BYTES: usize = 8;
 pub struct CrateCoverageContext<'ll, 'tcx> {
     /// Coverage data for each instrumented function identified by DefId.
     pub(crate) function_coverage_map:
-        RefCell<FxHashMap<Instance<'tcx>, FunctionCoverageCollector<'tcx>>>,
+        RefCell<FxIndexMap<Instance<'tcx>, FunctionCoverageCollector<'tcx>>>,
     pub(crate) pgo_func_name_var_map: RefCell<FxHashMap<Instance<'tcx>, &'ll llvm::Value>>,
 }
 
@@ -44,8 +44,8 @@ impl<'ll, 'tcx> CrateCoverageContext<'ll, 'tcx> {
 
     pub fn take_function_coverage_map(
         &self,
-    ) -> FxHashMap<Instance<'tcx>, FunctionCoverageCollector<'tcx>> {
-        self.function_coverage_map.replace(FxHashMap::default())
+    ) -> FxIndexMap<Instance<'tcx>, FunctionCoverageCollector<'tcx>> {
+        self.function_coverage_map.replace(FxIndexMap::default())
     }
 }