[jdk17u-dev] RFR: 8303588: [JVMCI] make JVMCI source directories conform with standard layout

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

The set of files of jvmci differ in 17 and head. 
Thus I had to fix the following:

The following four files: HotSpotConstantPoolObject.java  HotSpotMetaData.java  HotSpotSentinelConstant.java  TranslatedException.java
located in src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/ were not covered
by the change. I moved them by hand.

Moving files from 
a/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot.riscv64/src/jdk/vm/ci/hotspot/riscv64 and.
a/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.riscv64/src/jdk/vm/ci/riscv64/ dropped.
They are not in 17.

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Commit messages:
 - Backport 9fdbf3cfc4bf58daa93807b47e403536e4681e90

Changes: https://git.openjdk.org/jdk17u-dev/pull/1257/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1257&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303588
  Stats: 12 lines in 205 files changed: 0 ins; 12 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1257.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1257/head:pull/1257

PR: https://git.openjdk.org/jdk17u-dev/pull/1257