[flang][debug] Better handle array lower bound of assumed shape arrays. (#110302)

As mentioned in #108633, we don't respect the lower bound of the assumed
shape arrays if those were specified. It h

[flang][debug] Better handle array lower bound of assumed shape arrays. (#110302)

As mentioned in #108633, we don't respect the lower bound of the assumed
shape arrays if those were specified. It happens in both cases:
1. When caller has non-default lower bound and callee has default
2. When callee has non-default lower bound and caller has default

This PR tries to fix this issue by improving our generation of lower
bound attribute on DICompositeTypeAttr. If we see a lower bound in the
declaration, we respect that. Note that same function is also used for
allocatable/pointer variables. We make sure that we get the lower bound
from descriptor in those cases. Please note that DWARF assumes a lower
bound of 1 so in many cases we don't need to generate the lower bound.

Fixes #108633.

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[flang][debug] Add stride information for assumed shape array. (#106703)

Without this information, debugger could present wrong values for arrays
in certain cases as shown in issue #105646.

Fixe

[flang][debug] Add stride information for assumed shape array. (#106703)

Without this information, debugger could present wrong values for arrays
in certain cases as shown in issue #105646.

Fixes #105646.

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[flang][debug] Don't confuse count with upperBound. (#98174)

The code that handled allocatable array had swapped `count` with
`upperBound`. This did not get caught earlier as all the example were

[flang][debug] Don't confuse count with upperBound. (#98174)

The code that handled allocatable array had swapped `count` with
`upperBound`. This did not get caught earlier as all the example were
using 1 as `lowerBound`.

Fixes #98166.

With the fix in place, the GDB now correctly handles the case pointed in
the bug ticket.
(gdb) p min::alloc2d
$2 = ((0, 0, 0) (0, 0, 0) (0, 0, 0) (0, 0, 0) (0, 0, 0))
(gdb) ptype min::alloc2d
type = integer, allocatable (-1:1,-2:2)

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[flang][debug] Support assumed shape arrays. (#94644)

This PR generates dwarf to extract the information about the arrays from
descriptor. The DWARF needs the offset of the fields like `lower_bound

[flang][debug] Support assumed shape arrays. (#94644)

This PR generates dwarf to extract the information about the arrays from
descriptor. The DWARF needs the offset of the fields like `lower_bound`
and `extent`. The getComponentOffset has been added to calculate
them which pushes the issue of host and target data size into
getDescFieldTypeModel.

As we use data layout now, some tests needed to be adjusted to have a
dummy data layout to avoid failure.

With this change in place, GDB is able show the assumed shape arrays
correctly.

subroutine ff(n, m, arr)
integer n, m
integer :: arr(:, :)
print *, arr
do i = 1, n
do j = 1, m
arr(j, i) = (i * 5) + j + 10
end do
end do
print *, arr
end subroutine ff

Breakpoint 1, ff (n=4, m=3, arr=...) at test1.f90:13
13 print *, arr
(gdb) p arr
$1 = ((6, 7, 8, 9) (11, 12, 13, 14) (16, 17, 18, 19))
(gdb) ptype arr
type = integer (4,3)
(gdb) c
Continuing.
6 7 8 9 11 12 13 14 16 17 18 19

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