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A `:=`-bound closure with no explicit `-> T` and a BLOCK body inferred its
return type via inferExprType(lam.body), which yields the last statement's
type. A block whose value comes only from early `return`s ends in a return
statement (void/noreturn), so the closure was built with a void return while
the body returned i64 — the call site then fed `i64 undef` and LLVM
verification failed. (A block whose tail referenced a block-local hit the
sibling failure: inferExprType returned .unresolved → an LLVM panic.)
Infer the return type exactly as a named fn does (resolveReturnType in
lower.zig): an arrow body `(params) => expr` uses the expression type; a block
body `(params) { stmts }` takes the first explicit `return <val>` type via
findReturnValueType, else void (the block tail is a discarded statement unless
an explicit `-> R` makes it the value). Regression test:
examples/closures/0313-closure-inferred-return-early.sx.
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