9e76a83f69
Generic `Into(Block) for Closure(string) -> void` (step 5.2) emits
a trampoline whose `callconv(.c)` param type collapses through
`abiCoerceParamType`'s `string → ptr` heuristic — the libc
"char *" convention. The caller side (typed fn-pointer cast +
indirect call through `b.invoke`) keeps the full `{ptr, i64}`
slice. Result on AArch64: caller passes 16 bytes in x0+x1,
trampoline reads 8 bytes from x0 only, the slice len is lost or
mis-tracked, and the trampoline's `memcpy` from the half-formed
string segfaults.
`examples/188-block-string-arg.sx` pins the post-fix behaviour
("got: <hello>"). Today's run segfaults inside the trampoline's
first read. The next commit splits `abiCoerceParamType` into a
foreign-only path (extern decls keep the libc collapse) and a
preserve-slice path (sx-internal `callconv(.c)`).
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