[debug] introduce precise binary code coverage.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 745bd78fa0229917a5042ba3347be6628c5cf82d..acdd19478ab7c9f51c6ccb017d8a3070e560dc3e 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -1692,7 +1692,7 @@ void Shell::WriteIgnitionDispatchCountersFile(v8::Isolate* isolate) {
 void Shell::WriteLcovData(v8::Isolate* isolate, const char* file) {
   if (!file) return;
   HandleScope handle_scope(isolate);
-  debug::Coverage coverage = debug::Coverage::Collect(isolate, false);
+  debug::Coverage coverage = debug::Coverage::CollectPrecise(isolate);
   std::ofstream sink(file, std::ofstream::app);
   for (size_t i = 0; i < coverage.ScriptCount(); i++) {
     debug::Coverage::ScriptData script_data = coverage.GetScriptData(i);