[mlir][vector] NFC: Rename helper to check for all ones mask for consistency (#71810)

Following up on
#71676 (comment)

Author: qedawkins

mlir/include/mlir/Dialect/Vector/IR/VectorOps.td

@@ -2283,7 +2283,7 @@ def Vector_ConstantMaskOp :
     }
 
     /// Return whether the mask is a uniform vector of `1`s.
-    bool isFullMask();
+    bool isAllOnesMask();
   }];
 
   let assemblyFormat = "$mask_dim_sizes attr-dict `:` type(results)";

mlir/lib/Dialect/Vector/IR/VectorOps.cpp

@@ -3947,7 +3947,7 @@ static LogicalResult foldTransferFullMask(TransferOp op) {
   if (!constantMask)
     return failure();
 
-  if (!constantMask.isFullMask())
+  if (!constantMask.isAllOnesMask())
     return failure();
 
   op.getMaskMutable().clear();
@@ -5622,7 +5622,7 @@ LogicalResult ConstantMaskOp::verify() {
   return success();
 }
 
-bool ConstantMaskOp::isFullMask() {
+bool ConstantMaskOp::isAllOnesMask() {
   auto resultType = getVectorType();
   // Check the corner case of 0-D vectors first.
   if (resultType.getRank() == 0) {