[clang] [Clang][Sema] fix crash of attribute transform (PR #78088)

[Erich Keane via cfe-commits]

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@@ -7081,10 +7085,10 @@ QualType TreeTransform<Derived>::TransformAttributedType(
   // FIXME: dependent operand expressions?
   if (getDerived().AlwaysRebuild() ||
       modifiedType != oldType->getModifiedType()) {
-    // TODO: this is really lame; we should really be rebuilding the
-    // equivalent type from first principles.
-    QualType equivalentType
-      = getDerived().TransformType(oldType->getEquivalentType());
+    TypeLocBuilder AuxiliaryTLB;
+    AuxiliaryTLB.reserve(TL.getFullDataSize());
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erichkeane wrote:

Right, yeah, the location shouldn't have changed, just the type itself.  I think the suggestions above are the way to go.

https://github.com/llvm/llvm-project/pull/78088