Padding failures after LLVM bump

[nirvedhmeshram]

Failure is seen in following tests
LLVMCPU/test/pipeline_pad_tests.mlir
An example of IR from pipeline_tile_and_fuse.mlir is here
https://gist.github.com/nirvedhmeshram/3349f2739dfb529fa4800040bf1c8490
It needs to be verified that the IR generated is what we want and then the CHECK's need to be updated, the reason for this change is this PR
llvm/llvm-project#108032

[nirvedhmeshram]

@Groverkss this is not urgent, so whenever you have cycles could you please take a look.

[hanhanW]

I'll take a look when I have cycles. The pipeline is really not used at all, so it is on low priorities.