RFR: 8342769: HotSpot Windows/gcc port is broken [v16]

[Julian Waters]

> Several areas in HotSpot are broken in the gcc port. These, with the exception of 1 rather big oversight within SharedRuntime::frem and SharedRuntime::drem, are all minor correctness issues within the code. These mostly can be fixed with simple changes to the code. Note that I am not sure whether the SharedRuntime::frem and SharedRuntime::drem fix is correct. It may be that they can be removed entirely

Julian Waters has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 29 commits:

 - CAST_FROM_FN_PTR in os_windows.cpp
 - Merge branch 'master' into hotspot
 - Merge branch 'openjdk:master' into hotspot
 - _WINDOWS && AARCH64 in sharedRuntime.hpp
 - AARCH64 in sharedRuntimeRem.cpp
 - Refactor sharedRuntime.cpp
 - CAST_FROM_FN_PTR in os_windows.cpp
 - Merge branch 'openjdk:master' into hotspot
 - fmod_winarm64 in sharedRuntime.cpp
 - fmod_winarm64 in sharedRuntimeRem.cpp
 - ... and 19 more: https://git.openjdk.org/jdk/compare/5e9d72e2...3f9ca206

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Changes: https://git.openjdk.org/jdk/pull/21627/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21627&range=15
  Stats: 54 lines in 7 files changed: 23 ins; 7 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/21627.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21627/head:pull/21627

PR: https://git.openjdk.org/jdk/pull/21627