[clang] [llvm] [clang][SME] Rework streaming mode always_inline errors/warnings (PR #174608)

[Benjamin Maxwell via cfe-commits]

================
@@ -1370,6 +1370,11 @@ class ASTContext : public RefCountedBase<ASTContext> {
   /// are stored here.
   llvm::DenseMap<const CXXMethodDecl *, CXXCastPath> LambdaCastPaths;
 
+  /// Keep track of functions that contain expressions that are not valid in
+  /// streaming mode on AArch64. This is used to check inlining validity.
+  llvm::DenseSet<const FunctionDecl *>
+      AArch64ContansExprNotSafeForStreamingFunctions;
----------------
MacDue wrote:

Good spot :+1: 

https://github.com/llvm/llvm-project/pull/174608