[Bug bpf/23407] bpf: backend should support strings as first class values

["me at serhei dot io" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23407

--- Comment #1 from Serhei Makarov <me at serhei dot io> ---
The essential implementation has been completed. There is room to make the
register allocator much, much more clever in terms of providing temporary space
to store string literals, freeing it up to make room for other string literals,
and so forth. Currently all string literals in a probe are stored on the stack
throughout the lifetime of the probe.

To pass the string literals to a helper function, they must be zero-padded by
an unrolled pseudo-loop. There are a couple of places (the ones writing
map/global values rather than map keys) where this zero-padding code could be
eliminated if we instead zeroed out a sufficient proportion of the stack before
writing any string literals.

Leaving this PR open until I've come up with a more complex usage example, and
it becomes clear whether the smarter storage allocator ideas are necessary.

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