This commit introduces a `SelectLikeOpInterface` that can be used to
handle select-like operations generically. Select operations are similar
to control flow operations, as they forward operands depending on
conditions. This is the reason why it was placed to the already existing
control flow interfaces.

…en constructing the debug varaible for __coro_frame

As the title mentioned, do not search for the DILocalVariable for
__promise when constructing the debug variable for __coro_frame.

This should make sense because the debug variable of `__coro_frame`
shouldn't dependent on the debug variable of `__promise`. And actually,
it is not. Currently, we search the debug variable for `__promise` only
because we want to get the debug location and the debug scope for the
`__promise`. However, we can construct the debug location directly from
the debug scope of the being compiled function. Then it is not necessary
any more to search the `__promise` variable.

And this patch makes the codes to construct the debug variable for
`__coro_frame` to be more stable. Now we will always be able to
construct the debug variable for the coroutine frame no matter if we
found the debug variable for the __promise or not.

This patch is not strictly NFC but it is intended to not affect any end
users.

Verify that the arguments of a naked function are not used. They can
only be referenced via registers/stack in inline asm, not as IR values.
Doing so will result in assertion failures in the backend.

There's probably more that we should verify, though I'm not completely
sure what the constraints are (would it be correct to require that naked
functions are exactly an inline asm call + unreachable, or is more
allowed?)

Fixes llvm#104718.

/llvm-project/llvm/lib/Transforms/Coroutines/CoroFrame.cpp:1124:15:
error: unused variable 'PromiseAlloca' [-Werror,-Wunused-variable]
  AllocaInst *PromiseAlloca = Shape.getPromiseAlloca();
              ^
1 error generated.

…lvm#101108)

remove unused `__init__.py` under `mlir/python/mlir/extras`

Instead of entering an infinite loop.

The aim is to improve test coverage of data layout string parsing.

Pull Request: llvm#104545

Address post-commit comment for b8dccb7 to simplify code.

)

This PR is in reference to porting LLDB on AIX.

Link to discussions on llvm discourse and github:
1.  https://discourse.llvm.org/t/port-lldb-to-ibm-aix/80640
2.  llvm#101657 

The complete changes for porting are present in this draft PR:
llvm#102601

The changes on this PR are intended to avoid namespace collision for
certain typedefs between lldb and other platforms:
1. tid_t --> lldb::tid_t
2. offset_t --> lldb::offset_t

…n optimizations

This patch tries to salvage the debug information for the coroutine
frames within optimizations by creating the help alloca varaibles with
optimizations too. We didn't do this when I implement it initially. I
roughtly remember the reason was, we feel the additional help alloca
variable may pessimize the performance, which is almost the most
important thing under optimizations. But now, it looks like the new
inserted help alloca variables can be optimized out by the following
optimizations. So it looks like the time to make it available within
optimizations.

And also, it looks like the following optimizations will convert the
generated dbg.declare instrinsic into dbg.value intrinsic within
optimizations.

In LLVM's test, there is a slightly regression
that a dbg.declare for the promise object failed to be remained after
this change. But it looks like we won't have a chance to see dbg.declare
for the promise object when we split the coroutine as that dbg.declare
will be converted into a dbg.value in early stage.

So everything looks fine.

GitHub won't reflow the text unless we put it all on one line.

If we try to make our own paragrpahs it comes out too narrow or
too wide.

Use delegate() there. To fix a follow-up problem, abort when a cast ends
up on a valid Pointer that isn't a base class.

…functions (llvm#104703)

See also: llvm#94118, 7180170

This patch adds check for unsupported types in emitc, which fixes a
crash. Fix llvm#103706.