Add "is pointer in stresslog" contract function for SOS's GCHandleLea…

…ks functionality

docs/design/datacontracts/StressLog.md

@@ -36,6 +36,7 @@ bool HasStressLog();
 StressLogData GetStressLogData();
 IEnumerable<ThreadStressLogData> GetThreadStressLogs(TargetPointer Logs);
 IEnumerable<StressMsgData> GetStressMessages(ThreadStressLogData threadLog);
+bool IsPointerInStressLog(StressLogData stressLog, TargetPointer pointer);
 ```
 
 ## Versions 0 to 2
@@ -223,6 +224,27 @@ IEnumerable<StressMsgData> GetStressMessages(ThreadStressLog threadLog, uint for
         readPointer = new TargetPointer((ulong)readPointer + stressMsgHeaderSize + pointerSize * (uint)parsedMessage.Args.Count);
     }
 }
+
+bool IsPointerInStressLog(StressLogData stressLog, TargetPointer pointer)
+{
+    ulong chunckSize = target.GetTypeInfo(DataType.StressLogChunk).Size!.Value;
+    foreach (ThreadStressLogData threadLog in GetThreadStressLogs(stressLog.Logs))
+    {
+        TargetPointer chunkPtr = threadLog.ChunkListHead;
+        do
+        {
+            if (pointer.Value >= chunkPtr.Value && pointer.Value <= chunkPtr.Value + chunckSize)
+            {
+                return true;
+            }
+
+            Data.StressLogChunk chunk = target.ProcessedData.GetOrAdd<Data.StressLogChunk>(chunkPtr);
+            chunkPtr = chunk.Next;
+        } while (chunkPtr != TargetPointer.Null && chunkPtr != threadLog.ChunkListHead);
+    }
+
+    return false;
+}
 ```
 
 A StressLog message, represented by a `StressMsgData` struct, can be formatted as though the null-terminated UTF-8 string located at `FormatString` is a `printf`-style format string, with all arguments located at `Args`. Additionally, the following special format specifiers are supported:

src/native/managed/cdacreader/src/Contracts/StressLog.cs

@@ -215,6 +215,27 @@ public IEnumerable<StressMsgData> GetStressMessages(ThreadStressLogData threadLo
             readPointer = new TargetPointer((ulong)readPointer + stressMsgHeaderSize + pointerSize * (uint)parsedMessage.Args.Count);
         }
     }
+
+    public bool IsPointerInStressLog(StressLogData stressLog, TargetPointer pointer)
+    {
+        ulong chunckSize = target.GetTypeInfo(DataType.StressLogChunk).Size!.Value;
+        foreach (ThreadStressLogData threadLog in GetThreadStressLogs(stressLog.Logs))
+        {
+            TargetPointer chunkPtr = threadLog.ChunkListHead;
+            do
+            {
+                if (pointer.Value >= chunkPtr.Value && pointer.Value <= chunkPtr.Value + chunckSize)
+                {
+                    return true;
+                }
+
+                Data.StressLogChunk chunk = target.ProcessedData.GetOrAdd<Data.StressLogChunk>(chunkPtr);
+                chunkPtr = chunk.Next;
+            } while (chunkPtr != TargetPointer.Null && chunkPtr != threadLog.ChunkListHead);
+        }
+
+        return false;
+    }
 }
 
 file sealed class StressLog_0(Target target) : StressLog_0_2(target)