[mlir][amd] fix LLVM::InsertValueOp::create failure to disambiguate (#150605)

fixes
#149879 (comment)

Note this happens because ADL can't disambiguate between
`mlir::DenseI64ArrayAttr` and `llvm::ArrayRef<int64_t>` **for the value
0** which I guess is equal to nullptr on some (most?) systems.

Note, this only occurs with the value 0.

Author: makslevental

mlir/lib/Conversion/AMDGPUToROCDL/AMDGPUToROCDL.cpp

@@ -232,8 +232,8 @@ struct FatRawBufferCastLowering
     Value result = MemRefDescriptor::poison(
         rewriter, loc,
         getTypeConverter()->convertType(op.getResult().getType()));
-    result = LLVM::InsertValueOp::create(rewriter, loc, result, fatPtr,
-                                         kAllocatedPtrPosInMemRefDescriptor);
+    SmallVector<int64_t> pos{kAllocatedPtrPosInMemRefDescriptor};
+    result = LLVM::InsertValueOp::create(rewriter, loc, result, fatPtr, pos);
     result = LLVM::InsertValueOp::create(rewriter, loc, result, fatPtr,
                                          kAlignedPtrPosInMemRefDescriptor);
     result = LLVM::InsertValueOp::create(rewriter, loc, result, offset,