[Symbol] Increase DebugInformationLevel for manifest entries (dotnet#…

…4732)

Bumping the DebugInformationLevel to be preferred over the default

src/Microsoft.SymbolManifestGenerator/SymbolManifestGenerator.cs

@@ -14,7 +14,7 @@ namespace Microsoft.SymbolManifestGenerator;
 
 public static class SymbolManifestGenerator
 {
-    private const int Private = 340;
+    private const int TargetDebugLevel = 0x154 | 0x1 | 0x500; // Private | Binary | SourceIndexed
 
     public static bool GenerateManifest(ITracer tracer, DirectoryInfo dir, string manifestFileName, bool specialFilesRequireAdjacentRuntime = true)
     {
@@ -63,8 +63,7 @@ public static bool GenerateManifest(ITracer tracer, DirectoryInfo dir, string ma
                     BasedirRelativePath = basedirRelativePath,
                     SymbolKey = runtimeCorrelatedKey.Index,
                     Sha512 = fileHash,
-                    DebugInformationLevel = Private,
-                    LegacyDebugInformationLevel = Private
+                    DebugInformationLevel = TargetDebugLevel
                 };
 
                 manifestData.Entries.Add(manifestDataEntry);
@@ -143,7 +142,5 @@ private class ManifestDataEntry
         public string SymbolKey { get; set; }
         public string Sha512 { get; set; }
         public int DebugInformationLevel { get; set; }
-        [JsonPropertyName("DebugInformationLevel")]
-        public int LegacyDebugInformationLevel { get; set; }
     }
 }