[clang] Fix the double space and double attribute printing of the final keyword. (PR #88600)

[Kim Gräsman via cfe-commits]

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@@ -252,16 +252,19 @@ static DeclPrinter::AttrPosAsWritten getPosAsWritten(const Attr *A,
   return DeclPrinter::AttrPosAsWritten::Right;
 }
 
-void DeclPrinter::prettyPrintAttributes(const Decl *D,
+// returns true if an attribute was printed.
+bool DeclPrinter::prettyPrintAttributes(const Decl *D,
                                         AttrPosAsWritten Pos /*=Default*/) {
-  if (Policy.PolishForDeclaration)
-    return;
+  bool hasPrinted = false;
 
   if (D->hasAttrs()) {
     const AttrVec &Attrs = D->getAttrs();
     for (auto *A : Attrs) {
       if (A->isInherited() || A->isImplicit())
         continue;
+      // Don't strip out the keyword attributes, they aren't regular attributes.
+      if (Policy.PolishForDeclaration && !A->isKeywordAttribute())
----------------
kimgr wrote:

Nice, I was about to suggest something like this, but didn't know `isKeywordAttribute` existed.

https://github.com/llvm/llvm-project/pull/88600