Sylvie a71e4086a2 Use std::string_view for macro bodies (#1326) ...

This removes the last use of `strdup`

This required making a lot of related pointers be `const`.
That in turn conflicted with the need to `munmap()` a pointer
eventually, which was similar to the need to eventually `free()`
an `Expansion`'s contents, so I used the same solution of a
`union`. That lets us normally use the `const` pointer for
`const` correctness, and the non-`const` one for the not-really-
mutating destruction cases.

2024-03-02 13:21:28 -05:00

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