[mlir][nvvm] Remove unused check-ptx (#93147)

The test used the check generated ptx with `CHECK-PTX`, but does not
check that anymore. The PR removes these lines.

Author: grypp

mlir/test/Integration/GPU/CUDA/sm90/tma_load_64x8_8x128_noswizzle.mlir

@@ -6,15 +6,6 @@
 // RUN:   --entry-point-result=void \
 // RUN:  | FileCheck %s
 
-// Basic PTX check to make sure we are generating the right instructions.
-
-// CHECK-PTX: mbarrier.init.shared.b64
-// CHECK-PTX: mbarrier.arrive.expect_tx.shared.b64
-// CHECK-PTX: cp.async.bulk.tensor.2d.shared::cluster.global.mbarrier::complete_tx::bytes
-// CHECK-PTX: cp.async.bulk.tensor.2d.shared::cluster.global.mbarrier::complete_tx::bytes
-// CHECK-PTX: mbarrier.arrive.expect_tx.shared.b64
-// CHECK-PTX: mbarrier.try_wait.parity.shared.b64
-
 // RUN: mlir-opt %s --convert-nvgpu-to-nvvm \
 // RUN:         -gpu-kernel-outlining \
 // RUN:         -convert-nvvm-to-llvm \