[jdk13u-dev] RFR: 8248043: Need to eliminate excessive i2l conversions

[Sergey Nazarkin]

Hi!

I'd like to backport this fix for parity with jdk17/11. The change improves performance slightly and covered by test. 

Original patch applies cleanly. Tested by new tests and aarch64 tier1.

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Commit messages:
 - Backport 6d137a36169956171bfd0afef91e8ce29b568e33

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/208/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=208&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8248043
  Stats: 201 lines in 4 files changed: 201 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/208.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/208/head:pull/208

PR: https://git.openjdk.java.net/jdk13u-dev/pull/208