[flang][runtime] Expand IOTYPE and V_LIST (#160744)
The IOTYPE and V_LIST dummy arguments to a defined formatted I/O
subroutine are extracted from a DT edit descriptor in a FORMAT. They are
currently stored in the DataEdit structure, and their maximum sizes are
rather small since DataEdits are sometimes returned or passed by value.
This patch moves their storage into the FormattedIoStatementState
structure and enlarges them a bit.
Fixes https://github.com/llvm/llvm-project/issues/154954.
