hg: loom/loom: one more fix for cur_stack_depth issue: continuation part; added new test ContStackDepthTest

[serguei.spitsyn at oracle.com]

Changeset: dd40af6e6d6b
Author:    sspitsyn
Date:      2019-04-29 16:50 -0700
URL:       http://hg.openjdk.java.net/loom/loom/rev/dd40af6e6d6b

one more fix for cur_stack_depth issue: continuation part; added new test ContStackDepthTest

! src/hotspot/share/prims/jvmtiEventController.cpp
! src/hotspot/share/prims/jvmtiExport.cpp
! src/hotspot/share/prims/jvmtiThreadState.cpp
! src/hotspot/share/runtime/continuation.cpp
+ test/hotspot/jtreg/serviceability/jvmti/ContStackDepthTest/MyPackage/ContStackDepthTest.java
+ test/hotspot/jtreg/serviceability/jvmti/ContStackDepthTest/libContStackDepthTest.cpp