Include file names in trace-opt/trace-deopt output

Trace-opt/trace-deopt output is ambiguous if multiple functions share
the same name. This change adds file names to this output behind the
--trace-file-names flag to reduce this ambiguity.

R=ofrobots@google.com
BUG=

Review URL: https://codereview.chromium.org/1920873003

Cr-Commit-Position: refs/heads/master@{#35824}

src/flag-definitions.h

@@ -573,6 +573,8 @@ DEFINE_BOOL(mask_constants_with_cookie, true,
 DEFINE_BOOL(lazy, true, "use lazy compilation")
 DEFINE_BOOL(trace_opt, false, "trace lazy optimization")
 DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics")
+DEFINE_BOOL(trace_file_names, false,
+            "include file names in trace-opt/trace-deopt output")
 DEFINE_BOOL(opt, true, "use adaptive optimizations")
 DEFINE_BOOL(always_opt, false, "always try to optimize functions")
 DEFINE_BOOL(always_osr, false, "always try to OSR functions")

src/objects.cc

@@ -1921,6 +1921,18 @@ void JSObject::JSObjectShortPrint(StringStream* accumulator) {
       if (!printed) {
         accumulator->Add("<JS Function");
       }
+      if (FLAG_trace_file_names) {
+        Object* source_name =
+            Script::cast(function->shared()->script())->name();
+        if (source_name->IsString()) {
+          String* str = String::cast(source_name);
+          if (str->length() > 0) {
+            accumulator->Add(" <");
+            accumulator->Put(str);
+            accumulator->Add(">");
+          }
+        }
+      }
       accumulator->Add(" (SharedFunctionInfo %p)",
                        reinterpret_cast<void*>(function->shared()));
       accumulator->Put('>');