[lilliput-jdk17u:lilliput] RFR: 8308901: [Lilliput/JDK17] Cherry-pick C2 prototype header improvements [v2]

[Aleksey Shipilev]

> We need to pick up this improvement from upstream PR to Lilliput/JDK17:
>   https://github.com/rkennke/jdk/commit/3a18945ce900e229331b1412002da4a6965e0764
> 
> Additional testing:
>  - [ ] Linux x86_64 fastdebug `tier1`
>  - [ ] Linux x86_64 fastdebug `tier1` + `+UseCompactObjectHeaders`

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Missed LoadNode::Value hunk from the original patch

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

Changes:
  - all: https://git.openjdk.org/lilliput-jdk17u/pull/27/files
  - new: https://git.openjdk.org/lilliput-jdk17u/pull/27/files/ad200342..e37ba5a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=27&range=01
 - incr: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=27&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/27.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/27/head:pull/27

PR: https://git.openjdk.org/lilliput-jdk17u/pull/27