Downgrade to V8 8.6.334 again (#447)

After the upgrade some Deno tests started crashing somewhere deep inside
V8, and the cause of these crashes is unclear.

This reverts the following commits:
* 12334ff Upgrade gn to 6f13aaac; make BUILD.gn compatible with it (#443)
* f53f10d Upgrade V8 to 8.7.25 (#443)

Author: piscisaureus

BUILD.gn

@@ -1,20 +1,23 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import("//v8/gni/v8.gni")
 
-static_library("rusty_v8") {
-  complete_static_lib = true
+v8_static_library("rusty_v8") {
   sources = [ "src/binding.cc" ]
   deps = [
+    ":v8",
     "//build/config:shared_library_deps",
+  ]
+  configs = [ ":rusty_v8_config" ]
+}
+
+v8_source_set("v8") {
+  deps = [
     "//v8:v8",
     "//v8:v8_libbase",
     "//v8:v8_libplatform",
     "//v8:v8_libsampler",
   ]
-  configs -= [
-    "//build/config/compiler:default_init_stack_vars",
-    "//build/config/compiler:thin_archive",
-  ]
-  configs += [ ":rusty_v8_config" ]
+  configs = [ ":rusty_v8_config" ]
 }
 
 config("rusty_v8_config") {

README.md

@@ -1,6 +1,6 @@
 # Rusty V8 Binding
 
-V8 Version: 8.7.25
+V8 Version: 8.6.334
 
 [![ci](https://github.com/denoland/rusty_v8/workflows/ci/badge.svg?branch=master)](https://github.com/denoland/rusty_v8/actions)
 [![crates](https://img.shields.io/crates/v/rusty_v8.svg)](https://crates.io/crates/rusty_v8)

build

@@ -149,7 +149,7 @@ fn download_ninja_gn_binaries() {
     .parent()
     .unwrap();
   let bin_dir = target_dir
-    .join("ninja_gn_binaries-20200827")
+    .join("ninja_gn_binaries-20200806")
     .join(platform());
   let gn = bin_dir.join("gn");
   let ninja = bin_dir.join("ninja");

build.rs

@@ -3402,8 +3402,7 @@ fn heap_statistics() {
   assert!(s.total_global_handles_size() >= s.used_global_handles_size());
   assert!(s.used_heap_size() > 0);
   assert!(s.heap_size_limit() >= s.used_heap_size());
-  assert!(s.peak_malloced_memory() > 0);
-  assert!(s.malloced_memory() > 0);
+  assert!(s.peak_malloced_memory() >= s.malloced_memory());
   assert_eq!(s.number_of_native_contexts(), 0);
 
   let scope = &mut v8::HandleScope::new(isolate);