Add RISC-V support to OpenJDK test suites

[ChengJin01]

Signed-off-by: Cheng Jin [email protected]

[ChengJin01]

Note: the value of SPEC uses riscv-64 instead of riscv64.
If we agree to change to riscv64, then https://github.com/AdoptOpenJDK/TKG/blob/master/src/org/openj9/envInfo/JavaInfo.java needs to be updated to support this.

public String getSPEC() {
 ...
        String model = System.getProperty("sun.arch.data.model");
        System.out.println("System.getProperty('sun.arch.data.model')=" + model + "\n");
        if (Integer.parseInt(model.trim())==64) {
            spec += "-64"; <----- to be updated for riscv64
            spec = spec.replace("arm-64", "aarch64");
        }

Reviewer: @llxia

FYI: @ShelleyLambert , @sxa

[ChengJin01]

The SPEC for RISC-V has changed to riscv64 to align with the naming of buildspec in OpenJ9.

[llxia]

Could you test this PR with adoptium/TKG#83 using Grinder_TKG on any platform? Thanks

[ChengJin01]

Could you test this PR with AdoptOpenJDK/TKG#83 using Grinder_TKG on any platform? Thanks

Launched at Test_grinder/job/Grinder_TKG/632 with the changes at #1832 & adoptium/TKG#83

[llxia]

The above Grinder failed because of missing test image. Relaunched at Grinder_TKG/640

[llxia]

LGTM