RFR: 8342769: HotSpot Windows/gcc port is broken [v6]

[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 one additional commit since the last revision:

  Revise comment in sharedRuntime.hpp

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21627/files
  - new: https://git.openjdk.org/jdk/pull/21627/files/967b9606..b0083f8c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21627&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21627&range=04-05

  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 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