RFR: 8303863: RISC-V: TestArrayStructs.java fails after JDK-8303604

Thu Mar 9 14:48:23 UTC 2023

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[JDK-8303604](https://bugs.openjdk.org/browse/JDK-8303604) fixes an issue with passing structs whose size is not a power of two on SysV and AArch64 platforms. The same issue happens on RISC-V.

Modifications are unnecessary for `STRUCT_REGISTER_F` and `STRUCT_REGISTER_XF`. If there are no available registers, they will fall back to `STRUCT_REGISTER_X`.

Testing:

- [x] TestArrayStructs.java 
- [x] jdk_foreign on Unmatched Board (release build)

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Commit messages:
 - fix oob

Changes: https://git.openjdk.org/jdk/pull/12950/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12950&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303863
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12950.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12950/head:pull/12950

PR: https://git.openjdk.org/jdk/pull/12950