hg: loom/loom: clear FramePop requests as continuation yield; new test: ContinuationTest

[serguei.spitsyn at oracle.com]

Changeset: 9396de97aabc
Author:    sspitsyn
Date:      2019-04-11 00:44 -0700
URL:       http://hg.openjdk.java.net/loom/loom/rev/9396de97aabc

clear FramePop requests as continuation yield; new test: ContinuationTest

! src/hotspot/share/prims/jvmtiExport.cpp
! src/hotspot/share/prims/jvmtiExport.hpp
! src/hotspot/share/prims/jvmtiManageCapabilities.cpp
! src/hotspot/share/runtime/continuation.cpp
+ test/hotspot/jtreg/serviceability/jvmti/ContinuationTest/MyPackage/ContinuationTest.java
+ test/hotspot/jtreg/serviceability/jvmti/ContinuationTest/libContinuationTest.cpp