Let shaped declarative environments read static binding flags from their
EnvironmentShape instead of retaining a per-environment copy. The local
flag vector now mirrors the local name vector and only stores dynamic
bindings created after the shared shape.
Split EnvironmentShape binding descriptors into separate name and flag
vectors so the shared metadata is compact as well.
Cache EnvironmentShape on SharedFunctionInstanceData after the first
function environment creates its statically known bindings. Install the
cached shape before later calls create bindings so those environments
avoid building their own name vector and lookup map.
Let DeclarativeEnvironment keep a local overlay for eval-created
bindings, and keep the packed flag mirror per environment while the asm
interpreter still reads flags directly from the environment. Add runtime
coverage for repeated calls with an eval-created binding.
