anv/entrypoints: Generalize the string map a bit

The original string map assumed that the mapping from strings to
entrypoints was a bijection.  This will not be true the moment we
add entrypoint aliasing.  This reworks things to be an arbitrary map
from strings to non-negative signed integers.  The old one also had a
potential bug if we ever had a hash collision because it didn't do the
strcmp inside the lookup loop.  While we're at it, we break things out
into a helpful class.

Reviewed-by: Lionel Landwerlin <[email protected]>
Reviewed-by: Samuel Iglesias Gonsálvez <[email protected]>

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