[mlir][Linalg] fix comparison of integers with different signs

Since https://reviews.llvm.org/D142053, building mlir with clang using -Werror
fails reporting comparison of integers with different signs.

Fix this by using unsigned return types for
RelayoutOp::getSourceRank,getDestRank

Differential Revision: https://reviews.llvm.org/D142201

Author: tblah

mlir/include/mlir/Dialect/Tensor/IR/TensorOps.td

@@ -1667,8 +1667,8 @@ class Tensor_RelayoutOp<string mnemonic, list<Trait> traits = []> :
                    "$_self">])> {
 
   code commonExtraClassDeclaration = [{
-    int64_t getSourceRank() { return getSource().getType().getRank(); };
-    int64_t getDestRank() { return getDest().getType().getRank(); };
+    size_t getSourceRank() { return getSource().getType().getRank(); };
+    size_t getDestRank() { return getDest().getType().getRank(); };
     RankedTensorType getSourceType() {
       return getSource().getType().cast<RankedTensorType>(); };
     RankedTensorType getDestType() {

mlir/lib/Dialect/Linalg/TransformOps/LinalgTransformOps.cpp

@@ -1221,7 +1221,7 @@ bool isValidPackingPermutation(
       "applies to only pack or unpack operations");
   if (!op || permutation.empty())
     return true;
-  int64_t innerRank = op.getInnerDimsPos().size();
+  size_t innerRank = op.getInnerDimsPos().size();
   if (outerOrInnerPerm == OuterOrInnerPerm::Inner)
     return permutation.size() == innerRank && isPermutationVector(permutation);
   // op.getOuterDimsPerm() may be empty, in which case it is identity.