[convertBlockPtrToTensorOfPtr] Do not generate mask when boundary_check is not set (#2366)

`RewriteTensorPointer` also doesn't generate mask when `boundary_check`
is not set:
https://github.com/intel/intel-xpu-backend-for-triton/blob/main/third_party/intel/lib/TritonIntelGPUTransforms/RewriteTensorPointer.cpp#L206

Signed-off-by: Whitney Tsang <[email protected]>

Author: whitneywhtsang

test/TritonIntelGPU/blockptr_load.mlir

@@ -261,6 +261,8 @@ module attributes {"triton_gpu.num-warps" = 1 : i32, "triton_gpu.threads-per-war
 #dot_b = #triton_gpu.dot_op<{opIdx = 1, parent = #dpas, kWidth = 2}>
 module attributes {"triton_gpu.num-warps" = 1 : i32, "triton_gpu.threads-per-warp" = 16 : i32} {
   // CHECK-LABEL:   llvm.func spir_kernelcc @non_contiguous_load_dot_layout
+  // COM: Check mask is not generated when boundary_check is not set.
+  // CHECK-NOT: llvm.icmp "slt"
   tt.func public @non_contiguous_load_dot_layout(%arg0: !tt.ptr<f16>, %col_stride: i64) {
       %c64_i64 = arith.constant 64 : i64
       %c1_i64 = arith.constant 1 : i64

third_party/intel/lib/TritonIntelGPUToLLVM/LoadStoreOpToLLVM.cpp

@@ -230,7 +230,7 @@ struct LoadStoreConversionBase {
         };
 
     SmallVector<Value> ptrElems(numElems);
-    SmallVector<Value> maskElems(numElems);
+    SmallVector<Value> maskElems;
     for (unsigned i = 0; i < numElems; ++i) {
       auto index = indices[i];
       SmallVector<Value> indicesInTensor(rank);
@@ -251,15 +251,17 @@ struct LoadStoreConversionBase {
       ptrElems[i] = gep(ptr_ty(rewriter.getContext(), 1 /*global*/),
                         valueElemTy, blockPtr[blockBase], offset);
 
-      // Get the LLVM values for mask
-      maskElems[i] = linearize(
-          indicesInTensor,
-          {blockPtr.begin() + blockShape, blockPtr.begin() + blockStride},
-          int_val(1, 1),
-          [&](const Value &index, const Value &shape, const Value &mask) {
-            // mask = mask && (index < shape)
-            return and_(icmp_slt(index, trunc(i32_ty, shape)), mask);
-          });
+      if (boundaryCheck.size() > 0) {
+        // Get the LLVM values for mask
+        maskElems.push_back(linearize(
+            indicesInTensor,
+            {blockPtr.begin() + blockShape, blockPtr.begin() + blockStride},
+            int_val(1, 1),
+            [&](const Value &index, const Value &shape, const Value &mask) {
+              // mask = mask && (index < shape)
+              return and_(icmp_slt(index, trunc(i32_ty, shape)), mask);
+            }));
+      }
     }
 
     // Get the LLVM values for `other`