RFR: 8316428: G1: Nmethod count statistics only count last code root set iterated

[Thomas Schatzl]

Hi all,

  please review this small fix to nmethod code root counting where currently only the last code root set scanned counts.

Testing: gha

Hth,
  Thomas

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Commit messages:
 - 8316428 - initial version

Changes: https://git.openjdk.org/jdk/pull/15790/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15790&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316428
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15790.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15790/head:pull/15790

PR: https://git.openjdk.org/jdk/pull/15790