[flang][debug] Handle array types with variable size/bounds. (#110686)

The debug information generated by flang did not handle the cases where
dimension or lower bounds of the arrays were variable.

[flang][debug] Handle array types with variable size/bounds. (#110686)

The debug information generated by flang did not handle the cases where
dimension or lower bounds of the arrays were variable. This PR fixes
this issue. It will help distinguish assumed size arrays from cases
where array size are variable. It also handles the variable lower bounds
for assumed shape arrays.

Fixes #98879.

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[flang][debug] Support assumed size arrays. (#96316)

Here we don't know the size of last dimension and use a null subrange
for that. User will have to provide the dimension when evaluating
variabl

[flang][debug] Support assumed size arrays. (#96316)

Here we don't know the size of last dimension and use a null subrange
for that. User will have to provide the dimension when evaluating
variable of this type. The debugging looks like as follows:

subroutine fn(a1, a2)
integer a1(5, *), a2(*)
...
end

(gdb) p a1(1,2)
$2 = 2
(gdb) p a2(3)
$3 = 3
(gdb) ptype a1
type = integer (5,*)
(gdb) ptype a2
type = integer (*)

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