Implement new Function.prototype.toString and fix CreateDynamicFunction parsing

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index ad531d7d3ef8ff05aa302fb735af56e58fe5b4bb..1180fa035827169865af05ccdf2215c3bc073a28 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2194,12 +2194,13 @@ MaybeLocal<Function> ScriptCompiler::CompileFunctionInContext(
     column_offset = static_cast<int>(source->resource_column_offset->Value());
   }
   i::Handle<i::JSFunction> fun;
+  // TODO(jwolfe): restrict parameters_end_pos?
   has_pending_exception =
       !i::Compiler::GetFunctionFromEval(
            source_string, outer_info, context, i::SLOPPY,
-           i::ONLY_SINGLE_FUNCTION_LITERAL, eval_scope_position, eval_position,
-           line_offset, column_offset - scope_position, name_obj,
-           source->resource_options)
+           i::ONLY_SINGLE_FUNCTION_LITERAL, i::kNoSourcePosition,
+           eval_scope_position, eval_position, line_offset,
+           column_offset - scope_position, name_obj, source->resource_options)
            .ToHandle(&fun);
   if (has_pending_exception) {
     isolate->ReportPendingMessages();