RFR: 8315637: JDK-8314249 broke libgraal

[Ioi Lam]

Please review this change in JVMCI. The actual functional change is essentially the same as the patch provided by @dougxc in [JDK-8315637](https://bugs.openjdk.org/browse/JDK-8315637) -- convert the `rawIndex` to `cpci` only if the bytecode is INVOKE{VIRTUAL,SPECIAL,STATIC,INTERFACE}.

The rest of the changes is to rename the parameters from `rawIndex` to `which`, so we know the correct type of index is passed. I also added a test case.

(This code should be much simpler after [JDK-8301993](https://bugs.openjdk.org/browse/JDK-8301993) is complete: we won't have `cpci` anymore and all `which` can be replaced with `rawInex`).

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Commit messages:
 - fixed white spaces
 - 8315637: JDK-8314249 broke libgraal

Changes: https://git.openjdk.org/jdk/pull/15575/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15575&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315637
  Stats: 160 lines in 3 files changed: 110 ins; 25 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/15575.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15575/head:pull/15575

PR: https://git.openjdk.org/jdk/pull/15575