KarpelesLab / goro / 26392427217

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vm: lower $obj->$x = v / $obj->{$x} = v to OP_OBJECT_DYN_SET

Adds OP_OBJECT_DYN_SET handling the dynamic-name property write
shape that was previously generic-AST-delegated via OpClassConst.

Stack: [receiver, name, value] → optionally push value back.
  A bit 0 = keep-value-on-stack (expr context).

Handler validates the receiver is a ZObjectAccess (throwing
"Attempt to assign property \"NAME\" on TYPE" otherwise) and
dispatches through objI.ObjectSet — which already covers typed
properties, hooks, asymmetric visibility, etc.

emitObjectVarAssign routes runObjectVar with $-prefixed name
(\$obj->\$x = v) through the new opcode; a new
emitObjectDynVarAssign handles runObjectDynVar
(\$obj->{\$x} = v). Receiver-warn semantics match the AST
runners — runObjectVar suppresses the undefined-variable warning
via OpLoadLocal, runObjectDynVar does not (emitExpr → normal warn).

Also brings the dyn-form error message in line with real PHP:
"Attempt to assign property \"foo\" on int" (the AST runner was
omitting the property name).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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