[jdk21u-dev] RFR: 8327994: Update code gen in CallGeneratorHelper

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle.

Resolved shared.h, probably clean anyways.

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Commit messages:
 - Backport ac2f8e5af8c88cd13038b113f82bb7c17a38aa40

Changes: https://git.openjdk.org/jdk21u-dev/pull/1315/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1315&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327994
  Stats: 36078 lines in 6 files changed: 62 ins; 40 del; 35976 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1315.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1315/head:pull/1315

PR: https://git.openjdk.org/jdk21u-dev/pull/1315