Update linker repo to the latest SDK (#1995)

* Pick up the DynamicallyAccessedMemberTypes.Interfaces enum from runtime
* Update branding of the linker assembly
* Fix nullref in tests - corelib now has an assembly level attribute with annotations (so the reported "source" is null - since we can't represent assembly as a source just yet).

eng/Versions.props

@@ -6,7 +6,7 @@
     <MinorVersion>0</MinorVersion>
     <PatchVersion>100</PatchVersion>
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseVersionIteration>2</PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>5</PreReleaseVersionIteration>
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>
   </PropertyGroup>

global.json

@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "6.0.100-preview.4.21179.4",
+    "dotnet": "6.0.100-preview.5.21225.11",
     "runtimes": {
       "dotnet": [
         "5.0.0"

test/Mono.Linker.Tests/TestCasesRunner/ResultChecker.cs

@@ -998,9 +998,9 @@ void VerifyRecordedReflectionPatterns (AssemblyDefinition original, TestReflecti
 						// By now all verified recorded patterns were removed from the test recorder lists, so validate
 						// that there are no remaining patterns for this type.
 						var recognizedPatternsForType = reflectionPatternRecorder.RecognizedPatterns
-							.Where (pattern => pattern.Source.DeclaringType?.FullName == typeToVerify.FullName);
+							.Where (pattern => pattern.Source?.DeclaringType?.FullName == typeToVerify.FullName);
 						var unrecognizedPatternsForType = reflectionPatternRecorder.UnrecognizedPatterns
-							.Where (pattern => pattern.Source.DeclaringType?.FullName == typeToVerify.FullName);
+							.Where (pattern => pattern.Source?.DeclaringType?.FullName == typeToVerify.FullName);
 
 						if (recognizedPatternsForType.Any () || unrecognizedPatternsForType.Any ()) {
 							string recognizedPatterns = string.Join (Environment.NewLine, recognizedPatternsForType