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

[jcbeyler at google.com]

Changeset: 95888b0804a8
Author:    jcbeyler
Date:      2020-06-24 19:54 -0700
URL:       https://hg.openjdk.java.net/jdk/submit/rev/95888b0804a8

8247615: Initialize the bytes left for the heap sampler
Summary:
Reviewed-by

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