Update triton

[nhat-nguyen]

• instance methods .dyn_cast, .cast, .isa are all deprecated
• point the triton submodule from openai/triton to triton-lang/triton
• update lit tests containing tensor.expand_shape

Fixes #134

[zhaoshiz]

Thanks for working on this! I tried this branch with latest triton today. The only issue is:

  .../triton/third_party/triton_shared/tools/triton-shared-opt/../RegisterTritonSharedDialects.h:39:3: error: no member named 'registerTritonGPUPasses' in namespace 'mlir'; did you mean 'mlir::triton::gpu::registerTritonGPUPasses'?
     39 |   mlir::registerTritonGPUPasses();
        |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        |   mlir::triton::gpu::registerTritonGPUPasses
  .../triton/python/build/cmake.linux-x86_64-cpython-3.10/include/triton/Dialect/TritonGPU/Transforms/Passes.h.inc:1120:13: note: 'mlir::triton::gpu::registerTritonGPUPasses' declared here
   1120 | inline void registerTritonGPUPasses() {
        |             ^
  1 error generated.

The suggested fix works for me.

[nhat-nguyen]

@zhaoshiz Thanks. The branch has been 3-week old, I will update this again with the latest triton and apply your suggested fix.