[jdk18] RFR: 8265317: [vector] assert(payload->is_object()) failed: expected 'object' value for scalar-replaced boxed vector but got: NULL

[Vladimir Ivanov]

The assertion is too strong. it doesn't take into account the case of a scalar-replaced instance with a constant field (null in this particular case). 

Proposed fix relaxes the check. 

Testing: 
  * failing tests w/ -XX:+DeoptimizeALot
  * hs-tier2 w/ -XX:+DeoptimizeALot
  * hs-tier1 - hs-tier5

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

Commit messages:
 - 8265317: [vector] assert(payload->is_object()) failed: expected 'object' value for scalar-replaced boxed vector but got: NULL

Changes: https://git.openjdk.java.net/jdk18/pull/76/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=76&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265317
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/76.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/76/head:pull/76

PR: https://git.openjdk.java.net/jdk18/pull/76