git: openjdk/jdk21: 8310743: assert(reserved_rgn != nullptr) failed: Add committed region, No reserved region found

[Axel Boldt-Christmas]

Changeset: c9111d57
Author:    Axel Boldt-Christmas <aboldtch at openjdk.org>
Date:      2023-07-04 12:45:35 +0000
URL:       https://git.openjdk.org/jdk21/commit/c9111d57ce132d70d4360535254658ef6b8d134d

8310743: assert(reserved_rgn != nullptr) failed: Add committed region, No reserved region found

Reviewed-by: ayang
Backport-of: f393975d1b9423835a7aa42f6ffc0656499701d7

! src/hotspot/share/gc/z/zGlobals.hpp
! src/hotspot/share/gc/z/zMemory.cpp
! src/hotspot/share/gc/z/zMemory.hpp
+ src/hotspot/share/gc/z/zNMT.cpp
+ src/hotspot/share/gc/z/zNMT.hpp
! src/hotspot/share/gc/z/zPhysicalMemory.cpp
! src/hotspot/share/gc/z/zPhysicalMemory.hpp
! src/hotspot/share/gc/z/zVirtualMemory.cpp
! src/hotspot/share/gc/z/zVirtualMemory.hpp
! src/hotspot/share/gc/z/z_globals.hpp
+ test/hotspot/jtreg/gc/z/TestZForceDiscontiguousHeapReservations.java
+ test/hotspot/jtreg/gc/z/TestZNMT.java