[inspector] async stacks for Promise.then calls...

test/inspector/runtime/await-promise-expected.txt

Index: test/inspector/runtime/await-promise-expected.txt
diff --git a/test/inspector/runtime/await-promise-expected.txt b/test/inspector/runtime/await-promise-expected.txt
index e23ead86cd0a2be0f4820a609bfcc268de3aae6b..ae37bd6708e1186d69527e581378d74d2dbc4a9b 100644
--- a/test/inspector/runtime/await-promise-expected.txt
+++ b/test/inspector/runtime/await-promise-expected.txt
@@ -29,6 +29,18 @@ Running test: testRejectedPromise
             stackTrace : {
                 callFrames : [
                 ]
+                parent : {
+                    callFrames : [
+                        [0] : {
+                            columnNumber : 8
+                            functionName : 
+                            lineNumber : 0
+                            scriptId : <scriptId>
+                            url : 
+                        }
+                    ]
+                    description : Promise.reject
+                }
             }
             text : Uncaught (in promise)
         }