[promisehook] Implement PromiseHook

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index 45c3f7e3d0e91f5558c11ed79618a0ea3b7271e5..3b0d0a38c670d74506065b66167e423e1d484db3 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -8242,11 +8242,10 @@ Node* CodeStubAssembler::IsDebugActive() {
 }
 
 Node* CodeStubAssembler::IsPromiseHookEnabled() {
-  Node* const is_promisehook_enabled =
-      Load(MachineType::Uint8(),
-           ExternalConstant(
-               ExternalReference::is_promisehook_enabled_address(isolate())));
-  return Word32NotEqual(is_promisehook_enabled, Int32Constant(0));
+  Node* const promise_hook = Load(
+      MachineType::Uint8(),

[adamk, 2016/12/15 15:43:58]

Probably this needs to change now that it's a pointer instead of a bool. But as
a non-CSA-expert I'm not sure what the right way to change it is (in particular,
I'm curious how we deal with 32/64-bit pointers.

[gsathya, 2016/12/15 16:32:06]

Doh, ofc. Sorry for being sloppy!

+      ExternalConstant(ExternalReference::promise_hook_address(isolate())));
+  return Word32NotEqual(promise_hook, Int32Constant(0));
 }
 
 Node* CodeStubAssembler::AllocateJSPromise(Node* context) {