[CodeGen] Fix friend declaration in SSPLayoutAnalysis (#77447)

Author: paperchalice

llvm/include/llvm/CodeGen/StackProtector.h

@@ -66,7 +66,7 @@ class SSPLayoutInfo {
 };
 
 class SSPLayoutAnalysis : public AnalysisInfoMixin<SSPLayoutAnalysis> {
-  friend struct AnalysisInfoMixin<SSPLayoutAnalysis>;
+  friend AnalysisInfoMixin<SSPLayoutAnalysis>;
   using SSPLayoutMap = SSPLayoutInfo::SSPLayoutMap;
 
   static AnalysisKey Key;