[lworld] RFR: 8361369: [lworld] Treating primitives as isValue() leads to vm crash

[Chen Liang]

Need to update the checking logic. Culprit is the filter in valueTypeFields. Tested by running jshell.

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Commit messages:
 - Fix layout value type detection

Changes: https://git.openjdk.org/valhalla/pull/1500/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1500&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361369
  Stats: 12 lines in 2 files changed: 1 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/valhalla/pull/1500.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1500/head:pull/1500

PR: https://git.openjdk.org/valhalla/pull/1500