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[flang] Use a file descriptor in Temp struct (flang-compiler/f18#1036)

Authored by sscalpone on Mar 5 2020, 7:09 AM.

Description

[flang] Use a file descriptor in Temp struct (flang-compiler/f18#1036)

The struct Temp is used in the function call createUniqueFile
which only takes in a file descriptor instead of a file handler.
In Unix these are the same thing, but in Windows they are different.
Therefore, the type of the member of struct Temp is changed
from file handler to file descriptor and when closing the file
the file descriptor is converted to a file handler.

Original-commit: flang-compiler/f18@a8edb328f717305143ac827132c6d6f45e6e11b9
Reviewed-on: https://github.com/flang-compiler/f18/pull/1036

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