[FRONTEND][BACKEND] Fixed various bugs (#819)

- Fixed bugs on layout conversions for int1 data (we should use int8
internally for int1 data to prevent llvm from using vec<i1> which has
different semantics)
- Fixed semantics of some casts to bool in the frontend

python/src/triton.cc

@@ -170,9 +170,8 @@ void init_triton_ir(py::module &&m) {
       .def("replace_all_uses_with",
            [](mlir::Value &self, mlir::Value &newValue) {
              self.replaceAllUsesWith(newValue);
-           })
+           });
 
-      ;
   py::class_<mlir::BlockArgument, mlir::Value>(m, "block_arguement");
 
   py::class_<mlir::Region>(m, "region")
@@ -660,13 +659,13 @@ void init_triton_ir(py::module &&m) {
              auto loc = self.getUnknownLoc();
              // get element type if necessary
              mlir::Type srcType = src.getType();
+             auto srcTensorType = srcType.dyn_cast<mlir::RankedTensorType>();
+             auto dstTensorType = dstType.dyn_cast<mlir::RankedTensorType>();
              mlir::Type srcEltType = srcType;
              mlir::Type dstEltType = dstType;
-             if (dstType.isa<mlir::RankedTensorType>()) {
-               dstEltType =
-                   dstType.cast<mlir::RankedTensorType>().getElementType();
-               srcEltType =
-                   srcType.cast<mlir::RankedTensorType>().getElementType();
+             if (dstTensorType && srcTensorType) {
+               dstEltType = dstTensorType.getElementType();
+               srcEltType = srcTensorType.getElementType();
              }
              unsigned srcWidth = srcEltType.getIntOrFloatBitWidth();
              unsigned dstWidth = dstEltType.getIntOrFloatBitWidth();