RFR: 8301740: RISC-V: Address::uses() should check address mode

[Dingli Zhang]

Follow [JDK-8299733](https://bugs.openjdk.org/browse/JDK-8299733). Although RISC-V does not trigger the same issue at the moment, we should better deal with this as well.

We have only three addressing mode in RISC-V and I think switch statement is not needed. If we get another literal type, we can update here together with many places that would need to be updated at the same time. I think it's enough to just test for non-literal so far.

## Testing:

- all tier1 on unmatched board without new failures

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Commit messages:
 - Check mode in Address::uses()

Changes: https://git.openjdk.org/jdk/pull/12401/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12401&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301740
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12401.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12401/head:pull/12401

PR: https://git.openjdk.org/jdk/pull/12401