[MLIR][LLVM] Block address support (#134335)

Add support for import and translate.

MLIR does not support using basic block references outside a function
(like LLVM does), This PR does not consider changes to MLIR to that
respect. It instead introduces two new ops: `llvm.blockaddress` and
`llvm.blocktag`. Here's an example:

```
llvm.func @ba() -> !llvm.ptr {
  %0 = llvm.blockaddress <function = @ba, tag = <id = 1>> : !llvm.ptr
  llvm.br ^bb1
^bb1:  // pred: ^bb0
  llvm.blocktag <id = 1>
  llvm.return %0 : !llvm.ptr
}
```

Value `%0` hold the address of block tagged as `id = 1` in function
`@ba`. Block tags need to be unique within a function and use of
`llvm.blockaddress` requires a matching tag in a `llvm.blocktag`.

0 files changed, 0 insertions, 0 deletions