[inspector] better stacks for promises

test/inspector/debugger/collect-old-async-call-chains-expected.txt

Index: test/inspector/debugger/collect-old-async-call-chains-expected.txt
diff --git a/test/inspector/debugger/collect-old-async-call-chains-expected.txt b/test/inspector/debugger/collect-old-async-call-chains-expected.txt
index e3981b0603a8b1a10b8d5f304f472b549ad16393..e3a8842fde722c32f749cbf581a971ba3a3ca6f7 100644
--- a/test/inspector/debugger/collect-old-async-call-chains-expected.txt
+++ b/test/inspector/debugger/collect-old-async-call-chains-expected.txt
@@ -95,7 +95,7 @@ actual async chain len: 1
 
 inspector.setMaxAsyncTaskStacks(3)
 Run expression 'console.trace(42)' with async chain len: 2
-actual async chain len: 0
+actual async chain len: 1
 
 inspector.setMaxAsyncTaskStacks(3)
 Run expression 'console.trace(42)' with async chain len: 3
@@ -123,7 +123,7 @@ actual async chain len: 1
 
 inspector.setMaxAsyncTaskStacks(4)
 Run expression 'console.trace(42)' with async chain len: 3
-actual async chain len: 0
+actual async chain len: 1
 
 inspector.setMaxAsyncTaskStacks(4)
 Run expression 'console.trace(42)' with async chain len: 1
@@ -171,7 +171,7 @@ actual async chain len: 2
 
 inspector.setMaxAsyncTaskStacks(6)
 Run expression 'console.trace(42)' with async chain len: 3
-actual async chain len: 2

[kozy, 2017/04/26 17:41:39]

it was an empty async parent:
parent: {
callFrames: [],
description: 'Promise.resolve'
}

+actual async chain len: 1
 
 inspector.setMaxAsyncTaskStacks(6)
 Run expression 'console.trace(42)' with async chain len: 1