[clang] [Clang] Bugfixes and improved support for `AttributedType`s in lambdas (PR #85325)

[Aaron Ballman via cfe-commits]

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@@ -7231,12 +7226,16 @@ QualType TreeTransform<Derived>::TransformAttributedType(
   // FIXME: dependent operand expressions?
   if (getDerived().AlwaysRebuild() ||
       modifiedType != oldType->getModifiedType()) {
-    TypeLocBuilder AuxiliaryTLB;
-    AuxiliaryTLB.reserve(TL.getFullDataSize());
-    QualType equivalentType =
-        getDerived().TransformType(AuxiliaryTLB, TL.getEquivalentTypeLoc());
-    if (equivalentType.isNull())
-      return QualType();
+    // Do not transform the equivalent type if it is equal to the modified type.
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AaronBallman wrote:

It'd be better to explain *why* we don't want to transform (that we don't transform can be gleaned from reading the code).

https://github.com/llvm/llvm-project/pull/85325