RFR: 8350940: RISC-V: remove unnecessary assert_different_registers in minmax_fp

[Hamlin Li]

Hi,
Can you help to review this simple change?
Seems to me it's not necessary to assert_different_registers between dst/src1/src2 in minmax_fp.

Thanks

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/23842/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23842&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350940
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23842.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23842/head:pull/23842

PR: https://git.openjdk.org/jdk/pull/23842