[flang-commits] [flang] [Flang][HLFIR] Lower PACK(array, .TRUE.) to hlfir.reshape (PR #213603)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

@ejose02 , a small reproducer that you can use as a unit test in the next PR:

```fortran
program p
  character(3) :: a(4) = ['abc','def','ghi','jkl']
  character(3), allocatable :: b(:)
  b = pack(a, .true.)
  print *, b
end
```

Failure with this PR:
```
$ flang -c pack_char.f90
unsupported integer type
UNREACHABLE executed at .../flang/lib/Optimizer/Dialect/FIRType.cpp:524!
```



https://github.com/llvm/llvm-project/pull/213603