Fixed logical assignment short-circuit with non-writable properties.

Fixed logical assignment short-circuit with non-writable properties.

When the logical condition was already satisfied (e.g., falsy for &&=,
truthy for ||=, non-nullish for ??=), the short-circuit jump landed on
the property set instruction instead of past it.  This caused spurious
TypeErrors for non-writable, getter-only, and non-extensible property
targets even though no assignment should occur.

This fixes logical assignment introduced in 1a64ba68.
This change fixes 9 more tests in test262.