add architecture enum PPC64le

src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/Architecture.cs

@@ -13,5 +13,6 @@ public enum Architecture
         S390x,
         LoongArch64,
         Armv6,
+        Ppc64le,
     }
 }

src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/RuntimeInformation.cs

@@ -68,6 +68,8 @@ public static Architecture ProcessArchitecture
             => Architecture.S390x;
 #elif TARGET_LOONGARCH64
             => Architecture.LoongArch64;
+#elif TARGET_POWERPC64
+            => Architecture.Ppc64le;
 #else
 #error Unknown Architecture
 #endif

src/libraries/System.Runtime.InteropServices.RuntimeInformation/tests/CheckArchitectureTests.cs

@@ -48,6 +48,10 @@ public void VerifyArchitecture()
                     Assert.Equal(Architecture.Armv6, processArch);
                     break;
 
+                case Architecture.Ppc64le:
+                    Assert.Equal(Architecture.Ppc64le, processArch);
+                    break;
+
                 default:
                     Assert.False(true, "Unexpected Architecture.");
                     break;

src/libraries/System.Runtime/ref/System.Runtime.cs

@@ -12861,6 +12861,7 @@ public enum Architecture
         S390x = 5,
         LoongArch64 = 6,
         Armv6 = 7,
+        Ppc64le = 8,
     }
     public enum CharSet
     {