[jdk21u] RFR: 8317257: RISC-V: llvm build broken

[Vladimir Kempik]

Please review this backport to jdk21u.
It fixes issues with building risc-v port with clang/llvm

Almost clean, one part of original fix wasn't needed in 21u due to missing issue with statis_assert
The fix is pretty trivial, just make a hint to compile which method should be called here, identical to arm64 fix.

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Commit messages:
 - 8317257: RISC-V: llvm build broken

Changes: https://git.openjdk.org/jdk21u/pull/223/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=223&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317257
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/223.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/223/head:pull/223

PR: https://git.openjdk.org/jdk21u/pull/223