Fix compiler error

Author: mgehre-amd

lib/Conversion/TorchToTosa/TosaLegalizeUtils.cpp

@@ -304,19 +304,6 @@ std::optional<Value> getConstTensor<double>(PatternRewriter &rewriter,
   return const_op.getResult();
 }
 
-static LogicalResult checkValidityOfCast(Type src, Type dest) {
-  if (src == dest)
-    return success();
-
-  auto isValid = [](Type ty) {
-    return ty.isInteger(1) || ty.isInteger(8) || ty.isInteger(16) ||
-           ty.isInteger(32) || ty.isInteger(64) || ty.isBF16() || ty.isF16() ||
-           ty.isF32() || ty.isF64() || ty.isFloat8E4M3() || ty.isFloat8E5M2();
-  };
-
-  return success(isValid(src) && isValid(dest));
-}
-
 // Template specialization for float
 LogicalResult tosaCastTensorToType(PatternRewriter &rewriter, Operation *op,
                                    Value src, Type destType, Value &result) {