RFR: 8319429: Resetting MXCSR flags degrades ecore [v3]

[Volodymyr Paprotski]

> Improves vector rounding on ECore about 10x
> 
> (BEFORE) FpRoundingBenchmark.test_round_float        2048  thrpt    3  40.912 ± 0.044  ops/ms
> (AFTER ) FpRoundingBenchmark.test_round_float        2048  thrpt    3  431.682 ± 0.727  ops/ms

Volodymyr Paprotski has updated the pull request incrementally with one additional commit since the last revision:

  change option name

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16504/files
  - new: https://git.openjdk.org/jdk/pull/16504/files/f4c8c36e..fd956635

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16504&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16504&range=01-02

  Stats: 9 lines in 5 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/16504.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16504/head:pull/16504

PR: https://git.openjdk.org/jdk/pull/16504