[lworld] RFR: 8295086: [lworld] follow-up for JDK-8288131 [v2]

[Vicente Romero]

> code related to primitive classes needs to be hidden behind the -XDenablePrimitiveClasses flag, this work is a follow-up of JDK-8288131. Hiding this remaining code behind the flag is not absolutely necessary as it probably won't be executed anyways but it will make easier to located, and extract if needed, the code related with primitive classes only

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  following on with the changes after merge

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/793/files
  - new: https://git.openjdk.org/valhalla/pull/793/files/d65ccf63..115b7c18

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=793&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=793&range=00-01

  Stats: 83 lines in 9 files changed: 35 ins; 3 del; 45 mod
  Patch: https://git.openjdk.org/valhalla/pull/793.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/793/head:pull/793

PR: https://git.openjdk.org/valhalla/pull/793