[jdk17u-dev] RFR: 8338058: map_or_reserve_memory_aligned Windows enhance remap assertion

[Matthias Baesken]

Backport of 8338058; NULL vs nullptr , also include follow up

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Commit messages:
 - Backport 00aac4097abd3c5e6144734cfd44228bc31892fb

Changes: https://git.openjdk.org/jdk17u-dev/pull/2903/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2903&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338058
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2903.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2903/head:pull/2903

PR: https://git.openjdk.org/jdk17u-dev/pull/2903