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vm: lower extended clone() forms to OP_CLONE_EXT + helper

PHP 8.5+ \`clone(\$x, \$with)\`, \`clone(...\$arr)\`, and named-arg
clones previously went through the generic OpClassConst delegation
via IsValueExprAstDelegated. Adds EvalCloneExt helper +
OP_CLONE_EXT opcode + IsCloneExtNode predicate so the extended form
gets a dedicated dispatch.

Basic \`clone \$x\` continues to use OP_CLONE + EvalClone (faster
path, no AST node ref).

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

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