Move api symbols out of coverage for now

ConflictSet.cpp

@@ -1183,6 +1183,10 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
   int64_t oldestVersion;
 };
 
+// ==================== END IMPLEMENTATION ====================
+
+// GCOVR_EXCL_START
+
 void ConflictSet::check(const ReadRange *reads, Result *results,
                         int count) const {
   return impl->check(reads, results, count);
@@ -1246,10 +1250,6 @@ __attribute__((__visibility__("default"))) void ConflictSet_destroy(void *cs) {
 }
 }
 
-// ==================== END IMPLEMENTATION ====================
-
-// GCOVR_EXCL_START
-
 std::string printable(std::string_view key) {
   std::string result;
   for (uint8_t c : key) {