Peter Klausler c7f4c333af [flang] Make NEWUNIT= use a range suitable for INTEGER(KIND=1) and recycle unit numbers ...

Use a bit-set to manage runtime-generated I/O unit numbers, recycle
them after they're closed, and use a range of values that fits in
a minimal-sized integer.

Differential Revision: https://reviews.llvm.org/D118651

2022-01-31 15:20:21 -08:00

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