RFR: 8342769: HotSpot Windows/gcc port is broken [v2]

[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 incrementally with two additional commits since the last revision:

 - Revert sharedRuntime.cpp
 - Revert sharedRuntime_x86.cpp

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21627/files
  - new: https://git.openjdk.org/jdk/pull/21627/files/541d4f89..12e82f68

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21627&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21627&range=00-01

  Stats: 62 lines in 2 files changed: 31 ins; 31 del; 0 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