[PurHur]

Summary

• Add lib/JIT/CastHelper.php lowering for TYPE_CAST_ARRAY, TYPE_CAST_OBJECT, and TYPE_CAST_UNSET MCJIT opcodes (Zend zend_operators.c / CastSupport parity).
• Extend Analyzer escape/static-array coverage for cast expr ops so MCJIT compile does not bail on (object)['x'=>1] / chained casts.
• Fix LLVM insert-block loss when Object_::allocate() first links GcCollectCyclesRuntime (orphan phpc_gc_register IR).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/CastJitCompileTest.php'
# OK (3 tests, 7 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && export PHP_COMPILER_LLVM_PATH=/opt/llvm9 LD_LIBRARY_PATH=/opt/llvm9 && php -r "
require \"vendor/autoload.php\";
\$rt = new PHPCompiler\\Runtime();
\$block = \$rt->parseAndCompile(\"<?php echo count((array)(object)[\\\"x\\\"=>1]);\", \"cast_probe.php\");
\$rt->jitCompileBlock(\$block);
\$rt->jitEmitInPlace();
ob_start();
\$block->handler();
echo ob_get_clean();
"'
# 1

Issue repro count((array)(object)["x"=>1]) → 1 on JIT execute.

Closes #4887

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