fix compile warning (#2453)

Author: qingyunqu

lib/Dialect/Torch/Transforms/DecomposeComplexOps.cpp

@@ -4910,7 +4910,7 @@ class DecomposeAtenIndexTensorOp : public OpRewritePattern<AtenIndexTensorOp> {
 
     SmallVector<bool> indexUsed =
         llvm::to_vector(llvm::map_range(indices, isTensor));
-    for (size_t i = indices.size(); i < inputRank; ++i) 
+    for (int64_t i = indices.size(); i < inputRank; ++i)
       indexUsed.emplace_back(false);
     bool indexIsConsecutive = true;
     int64_t firstUsedIndex = -1;

lib/Dialect/TorchConversion/Transforms/ConvertCustomQuantOp.cpp

@@ -86,7 +86,8 @@ class ConvertCustomQuantizedMatmulOp : public OpConversionPattern<OperatorOp> {
     if (failed(getConstantIntegerFromDefiningOp(unpackedTypeWidth, unpackedBitWidth))) {
       return failure();
     }
-    if (unpackedBitWidth != rhsElementType.getIntOrFloatBitWidth()) {
+    if (unpackedBitWidth !=
+        static_cast<int>(rhsElementType.getIntOrFloatBitWidth())) {
       return failure();
     }