8318086: [jvmci] RISC-V: Reuse target config from TargetDescription

Reviewed-by: fyang, mli

Author: feilongjiang

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/riscv64/RISCV64HotSpotJVMCIBackendFactory.java

@@ -99,7 +99,7 @@ protected HotSpotConstantReflectionProvider createConstantReflection(HotSpotJVMC
     }
 
     private static RegisterConfig createRegisterConfig(RISCV64HotSpotVMConfig config, TargetDescription target) {
-        return new RISCV64HotSpotRegisterConfig(target, config.useCompressedOops, config.linuxOs);
+        return new RISCV64HotSpotRegisterConfig(target, config.useCompressedOops, target.linuxOs);
     }
 
     protected HotSpotCodeCacheProvider createCodeCache(HotSpotJVMCIRuntime runtime, TargetDescription target, RegisterConfig regConfig) {

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/riscv64/RISCV64HotSpotVMConfig.java

@@ -24,8 +24,6 @@
 
 import jdk.vm.ci.hotspot.HotSpotVMConfigAccess;
 import jdk.vm.ci.hotspot.HotSpotVMConfigStore;
-import jdk.vm.ci.services.Services;
-import jdk.internal.util.OperatingSystem;
 
 /**
  * Used to access native configuration details.
@@ -38,8 +36,6 @@ class RISCV64HotSpotVMConfig extends HotSpotVMConfigAccess {
         super(config);
     }
 
-    final boolean linuxOs = OperatingSystem.isLinux();
-
     final boolean useCompressedOops = getFlag("UseCompressedOops", Boolean.class);
 
     // CPU Capabilities