Update V8 to version 4.1.0.21

This is a cherry-pick of all commits up to and including the
4.1.0.21 cherry-pick in Chromium.

Original commit message:

Version 4.1.0.21 (cherry-pick)

Merged 206e9136bde0f2b5ae8cb77afbb1e7833e5bd412

Unlink pages from the space page list after evacuation.

BUG=430201
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/953813002

Cr-Commit-Position: refs/branch-heads/4.1@{#22}
Cr-Branched-From: 2e08d2a7aa9d65d269d8c57aba82eb38a8cb0a18-refs/heads/candidates@{#25353}

---

FPIIM-449

Change-Id: I8c23c7bbb70772b4858fe8a47b64fa97ee0d1f8c
diff --git a/src/mips64/interface-descriptors-mips64.cc b/src/mips64/interface-descriptors-mips64.cc
index 8759bdd..44c8dff 100644
--- a/src/mips64/interface-descriptors-mips64.cc
+++ b/src/mips64/interface-descriptors-mips64.cc
@@ -29,6 +29,9 @@
 const Register StoreDescriptor::ValueRegister() { return a0; }
 
 
+const Register StoreTransitionDescriptor::MapRegister() { return a3; }
+
+
 const Register ElementTransitionAndStoreDescriptor::MapRegister() { return a3; }
 
 
@@ -149,6 +152,15 @@
 }
 
 
+void AllocateHeapNumberDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // register state
+  // cp -- context
+  Register registers[] = {cp};
+  data->Initialize(arraysize(registers), registers, nullptr);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   // register state