[lworld] RFR: 8269274: [lworld] Withfield instruction fails to verify when operand stack contains LPrimitiveClass;

[Harold Seigel]

Please remove this small lworld fix to the verifier to no longer require that the withfield operand be a Q-type.  The fix was tested with Mach5 tiers 1-2 on Linux, Mac OS, and Windows.

Thanks, Harold

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Commit messages:
 - 8269274: [lworld] Withfield instruction fails to verify when operand stack contains LPrimitiveClass;

Changes: https://git.openjdk.java.net/valhalla/pull/464/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=464&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269274
  Stats: 153 lines in 3 files changed: 142 ins; 8 del; 3 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/464.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/464/head:pull/464

PR: https://git.openjdk.java.net/valhalla/pull/464