[Triton-MLIR][BACKEND] Make mmav1 works on basic cases (#944)

TODO:

- Add more cases
- Currently, we just set vec to 4 to make the basic cases pass

Issue:

- the vec in shared layout is different compared to master branch
- when vec=1, it encounters CUDA misalignment error, it doesn't work in
master branch as well
- when setting vec to the value identical to master branch, the MMA
works

lib/Conversion/TritonGPUToLLVM/Utility.h

@@ -111,6 +111,8 @@
   LLVM::createIndexConstant(rewriter, loc, this->getTypeConverter(),           \
                             __VA_ARGS__)
 
+#define tid_val() getThreadId(rewriter, loc)
+
 namespace mlir {
 namespace LLVM {
 using namespace mlir::triton;