Shenandoah: Heap region count calculation still wrong after JDK-8265239

Nightly caught:

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/shenandoahHeap.cpp:156
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/jenkins/workspace/nightly/jdk-jdk/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp:156), pid=38919, tid=38930
# assert(_num_regions == (max_byte_size / reg_size_bytes)) failed: Must match
#
# JRE version: (17.0) (fastdebug build )
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 17-internal+0-adhoc.jenkins.jdk-jdk, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, shenandoah gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x15c8fcf] ShenandoahHeap::initialize()+0xcf
#
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/jenkins/workspace/nightly/jdk-jdk/build/linux-x86_64-server-fastdebug/test-support/jtreg_test_hotspot_jtreg_tier1/scratch/1/hs_err_pid38919.log
#
#

Apparently, JDK-8265239 did not fix the problem if heap needs to align to large page.

Can be easily reproduced:
make CONF=linux-x86_64-server-fastdebug TEST_VM_OPTS="-XX:+UseShenandoahGC -XX:+AlwaysPreTouch -XX:-SegmentedCodeCache -XX:+UseTransparentHugePages" run-test TEST=runtime/os/TestTracePageSizes.java