Upgrade V8 to 8.7.25 (denoland#443)

Author: ry

README.md

@@ -1,6 +1,6 @@
 # Rusty V8 Binding
 
-V8 Version: 8.6.334
+V8 Version: 8.7.25
 
 [![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

@@ -3350,6 +3350,8 @@ extern "C" fn heap_limit_callback(
   current_heap_limit * 2 // Avoid V8 OOM.
 }
 
+// This test might fail due to a bug in V8. The upstream bug report is at
+// https://bugs.chromium.org/p/v8/issues/detail?id=10843.
 #[test]
 fn heap_limits() {
   let _setup_guard = setup();
@@ -3366,14 +3368,14 @@ fn heap_limits() {
   let scope = &mut v8::ContextScope::new(scope, context);
 
   // Allocate JavaScript arrays until V8 calls the near-heap-limit callback.
-  // It takes about 100-200k iterations of this loop to get to that point.
+  // It takes about 50-200k iterations of this loop to get to that point.
   for _ in 0..1_000_000 {
     eval(
       scope,
       r#"
         "hello 🦕 world"
-          .repeat(5)
-          .split("🦕", 2)
+          .repeat(10)
+          .split("🦕")
           .map((s) => s.split(""))
           .shift()
       "#,
@@ -3400,7 +3402,8 @@ 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() >= s.malloced_memory());
+  assert!(s.peak_malloced_memory() > 0);
+  assert!(s.malloced_memory() > 0);
   assert_eq!(s.number_of_native_contexts(), 0);
 
   let scope = &mut v8::HandleScope::new(isolate);

buildtools

@@ -1,8 +1,8 @@
 # WARNING: This is not an automated tool! This is just some commands to copy and
 # paste manually to upgrade V8.
 
-export BRANCH=20200806_rusty_v8
-export COMMITDATE=2020-08-05T17:03:41.000Z
+export BRANCH=20200827_rusty_v8
+export COMMITDATE=2020-08-26T18:48:51.000Z
 
 git submodule update -f
 git submodule foreach 'git remote rm upstream; true' &&