hg: jdk/sandbox: 8247615: Initialize the bytes left for the heap sampler

[chris.hegarty at oracle.com]

Changeset: 13ec613f9373
Author:    jcbeyler
Date:      2020-07-16 16:58 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/13ec613f9373

8247615: Initialize the bytes left for the heap sampler
Summary: Initialize the heap sampler correctly before usage
Reviewed-by: sspitsyn, martin, manc

! src/hotspot/share/gc/shared/threadLocalAllocBuffer.hpp
! src/hotspot/share/runtime/threadHeapSampler.hpp
+ test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorInitialAllocationTest.java