Resolve dynamic identifier assignment targets before evaluating the
right hand side, then store through that saved environment record. This
matches the ECMA-262 ordering for simple assignment and var initializers
when a with binding is deleted or direct eval creates a nearer var.
Add runtime coverage for with and direct-eval cases and refresh bytecode
expectations for dynamic assignments that now snapshot the binding
before storing.
WithStatement evaluation updates empty statement completions to
undefined. The bytecode generator reused the surrounding completion
register while compiling the with body, so an empty break or continue
could leak the enclosing loop's previous completion value.
Give the with body its own completion register initialized to undefined
and add regression coverage for abrupt exits from the body.
Dynamic environment binding opcodes lost the old coordinate warmup.
They were split away from the static coordinate opcodes. Hot closures
and eval-sensitive functions then resolved the same binding by name on
every execution, which regressed JS benchmark throughput badly.
Give each dynamic environment opcode a per-executable coordinate cache
slot. The cache keeps the bytecode stream immutable while letting both
interpreters take a direct declarative environment fast path after the
first lookup. Keep the existing eval invalidation behavior and only warm
caches for declarative-only chains so with environments continue to
observe object shadowing.
Reject cached bytecode that uses the no-cache sentinel for dynamic
environment coordinate cache operands, since execution indexes those
cache arrays unconditionally.
Rebaseline bytecode expectations for the instruction size changes. Add
coverage for with-object shadowing across repeated dynamic lookups and
for rejecting corrupt dynamic environment cache indices.
