aaron.ballman added inline comments.

================
Comment at: clang/include/clang/Basic/Attr.td:2427-2430
+def ArmStreaming : TypeAttr, TargetSpecificAttr<TargetAArch64> {
+  let Spellings = [RegularKeyword<"__arm_streaming">];
+  let Documentation = [Undocumented];
+}
----------------
I'd feel more comfortable switching an existing attribute over to use this new 
functionality instead of introducing a new attribute at the same time. (Also, 
we ask that there be no new undocumented attributes unless there's a Very Good 
Reason to leave it undocumented.)


================
Comment at: clang/include/clang/Lex/Token.h:122
+
+  /// Return true if K is a keyword that is parsed in the same position as
+  /// a standard attribute, but that has semantic meaning and so cannot be
----------------



================
Comment at: clang/lib/AST/TypePrinter.cpp:1724-1727
+  if (T->getAttrKind() == attr::ArmStreaming) {
+    OS << "__arm_streaming";
+    return;
+  }
----------------
This seems like something that tablegen should automatically handle more 
generally for these attributes.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D148700/new/

https://reviews.llvm.org/D148700

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