[jdk13u-dev] RFR: 8272720: Fix the implementation of loop unrolling heuristic with LoopPercentProfileLimit

[Roman Marchenko]

Backport of JDK-8272720 to 13u
Applied cleanely, no tier1 tests regressions.

-------------

Commit messages:
 - Backport 1ea437a4b87381b558cf8157ac52fc03e37ac507

Changes: https://git.openjdk.org/jdk13u-dev/pull/404/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk13u-dev&pr=404&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8272720
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk13u-dev/pull/404.diff
  Fetch: git fetch https://git.openjdk.org/jdk13u-dev pull/404/head:pull/404

PR: https://git.openjdk.org/jdk13u-dev/pull/404