Update TODOs for RiscV64 Machine and Architecture in Crossgen2 (#97021)

Fixes #96438

Author: ashaurtaev

src/coreclr/tools/Common/CommandLineHelpers.cs

@@ -96,7 +96,7 @@ public static TargetArchitecture GetTargetArchitecture(string token)
                     Architecture.Arm => TargetArchitecture.ARM,
                     Architecture.Arm64 => TargetArchitecture.ARM64,
                     Architecture.LoongArch64 => TargetArchitecture.LoongArch64,
-                    (Architecture)9 => TargetArchitecture.RiscV64, /* TODO: update with Architecture.RiscV64 */
+                    Architecture.RiscV64 => TargetArchitecture.RiscV64,
                     _ => throw new NotImplementedException()
                 };
             }

src/coreclr/tools/aot/ILCompiler.ReadyToRun/ObjectWriter/TargetExtensions.cs

@@ -91,7 +91,7 @@ public static Machine MachineFromTarget(this TargetDetails target)
                     return Machine.LoongArch64;
 
                 case Internal.TypeSystem.TargetArchitecture.RiscV64:
-                    return (Machine)0x5064; /* TODO: update with RiscV64 */
+                    return Machine.RiscV64;
 
                 default:
                     throw new NotImplementedException(target.Architecture.ToString());

src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/GCInfoTypes.cs

@@ -154,7 +154,7 @@ internal GcInfoTypes(Machine machine)
                     STACK_BASE_REGISTER_ENCBASE = 2;
                     NUM_REGISTERS_ENCBASE = 3;
                     break;
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     SIZE_OF_RETURN_KIND_FAT = 4;
                     STACK_BASE_REGISTER_ENCBASE = 2;
                     NUM_REGISTERS_ENCBASE = 3;
@@ -170,7 +170,7 @@ internal int DenormalizeCodeLength(int x)
                     return (x << 1);
                 case Machine.Arm64:
                 case Machine.LoongArch64:
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     return (x << 2);
             }
             return x;
@@ -186,7 +186,7 @@ internal int DenormalizeStackSlot(int x)
                     return (x << 2);
                 case Machine.Arm64:
                 case Machine.LoongArch64:
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     return (x << 3);
             }
             return x;
@@ -204,7 +204,7 @@ internal uint DenormalizeStackBaseRegister(uint x)
                     return (x ^ 29);
                 case Machine.LoongArch64:
                     return ((x ^ 22) & 0x3);
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     return (x ^ 8);
             }
             return x;
@@ -220,7 +220,7 @@ internal uint DenormalizeSizeOfStackArea(uint x)
                     return (x << 2);
                 case Machine.Arm64:
                 case Machine.LoongArch64:
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     return (x << 3);
             }
             return x;

src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunReader.cs

@@ -633,7 +633,7 @@ private unsafe void EnsureHeader()
                 case Machine.Amd64:
                 case Machine.Arm64:
                 case Machine.LoongArch64:
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     _pointerSize = 8;
                     break;
 
@@ -1417,7 +1417,7 @@ private void EnsureImportSections()
                         case Machine.Amd64:
                         case Machine.Arm64:
                         case Machine.LoongArch64:
-                        case (Machine)0x5064: /* TODO: update with RiscV64 */
+                        case Machine.RiscV64:
                             entrySize = 8;
                             break;
 

src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/TransitionBlock.cs

@@ -34,7 +34,7 @@ public static TransitionBlock FromReader(ReadyToRunReader reader)
                 case Machine.LoongArch64:
                     return LoongArch64TransitionBlock.Instance;
 
-                case (Machine)0x5064: /* TODO: update with RiscV64 */
+                case Machine.RiscV64:
                     return RiscV64TransitionBlock.Instance;
 
                 default:

src/libraries/System.Reflection.Metadata/src/System/Reflection/PortableExecutable/PEHeaderBuilder.cs

@@ -105,7 +105,7 @@ public static PEHeaderBuilder CreateLibraryHeader()
             return new PEHeaderBuilder(imageCharacteristics: Characteristics.ExecutableImage | Characteristics.Dll);
         }
 
-        internal bool Is32Bit => Machine != Machine.Amd64 && Machine != Machine.IA64 && Machine != Machine.Arm64 && Machine != (Machine)0x5064; /* TODO: update with RiscV64 */
+        internal bool Is32Bit => Machine != Machine.Amd64 && Machine != Machine.IA64 && Machine != Machine.Arm64 && Machine != Machine.RiscV64;
 
         internal int ComputeSizeOfPEHeaders(int sectionCount) =>
             PEBuilder.DosHeaderSize +