[MILR][NFC] Silence clang-tidy warning in AffineOps.cpp

Silence clang-tidy warning in AffineOps.cpp due to the inability to see
through the typeswitch. NFC.

Differential Revision: https://reviews.llvm.org/D106125

mlir/lib/Dialect/Affine/IR/AffineOps.cpp

@@ -107,9 +107,12 @@ static bool remainsLegalAfterInline(OpTy op, Region *src, Region *dest,
 
 /// Checks if an affine apply operation remains legal after inlining from `src`
 /// to `dest`.
+//  Use "unused attribute" marker to silence clang-tidy warning stemming from
+//  the inability to see through "llvm::TypeSwitch".
 template <>
-bool remainsLegalAfterInline(AffineApplyOp op, Region *src, Region *dest,
-                             const BlockAndValueMapping &mapping) {
+bool LLVM_ATTRIBUTE_UNUSED
+remainsLegalAfterInline(AffineApplyOp op, Region *src, Region *dest,
+                        const BlockAndValueMapping &mapping) {
   // If it's a valid dimension, we need to check that it remains so.
   if (isValidDim(op.getResult(), src))
     return remainsLegalAfterInline(