[jdk21u-dev] RFR: 8314056: Remove runtime platform check from frem/drem

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle.

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Commit messages:
 - Backport ce2a7ea40a22c652e5f8559c91d5eea197e2d708

Changes: https://git.openjdk.org/jdk21u-dev/pull/1685/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1685&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314056
  Stats: 196 lines in 8 files changed: 67 ins; 86 del; 43 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1685.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1685/head:pull/1685

PR: https://git.openjdk.org/jdk21u-dev/pull/1685