KarpelesLab / goro / 26434357893

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vm: lower $arr[k] OP= rhs and $arr[k]++ on simple-local arr natively

Add OP_ARRAY_COMPOUND_ASSIGN_LOCAL and OP_ARRAY_INC_DEC_LOCAL,
extending the existing OP_ARRAY_SET_LOCAL fast path to compound
assigns and inc/dec on simple-local array containers.

Both opcodes read the current element via arrayGet (which warns on
undef keys, matching the AST), Dup snapshot (defending against
__toString/error_handler slot-mutation during '.=' coercion), apply
compoundOp / DoInc, then write back via arraySetLocal.

Eliminates two AST-delegation call sites in emit_expr.go:
  - $local[k] OP= rhs   (was line 1139)
  - $local[k]++ / dec   (was line 1271)

Side effect: fixes a pre-existing AST panic on '$x = $a[k]++'
expr-context postfix where the snapshot+DoInc path crashed with
'SetVal() called on cached ZVal'. The VM dispatch correctly Dup's
before DoInc.

Nested containers ($obj->arr[i] OP= …, $a[i][j]++, …) still
AST-delegate.

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

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