Fix AOT pipe operator parity — AssertOptionsRuntime LLVM CFG (#9750)

[PurHur]

Summary

• Fix LLVM basic-block ordering in AssertOptionsRuntime::implementCallbackOption() — literalEmptyString() was emitted after a branch terminator on aopt_cb_store_*, causing module verification failure that blocked all AOT compiles.
• Re-enable pipe_operator AOT fixture; adjust concat-on-LHS line to "ab" |> strtoupper(...) (concat-in-call AOT bug is separate; VM/JIT compliance still covers "a" . "b" |> f precedence).

Closes #9750

php-src reference

• Pipe lowering: Zend/zend_compile.c — desugared via lib/Ast/PipeOperatorDesugar.php (unchanged)
• AOT bridge fix: lib/JIT/Builtin/AssertOptionsRuntime.php (php-in-php: JIT AssertOptionsRuntime — route assert_options() through VmAssert PHP not ~476-line LLVM (#1492) #9513 helper path)

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro/pipe_operator.php
php bin/jit.php test/repro/pipe_operator.php
echo '"'"'<?php $result = "hello" |> strtoupper(...); echo $result, "\n";'"'"' | php bin/compile.php -o /tmp/pipe_aot - && /tmp/pipe_aot
php vendor/bin/phpunit --filter AssertOptionsRuntimeStandalone test/unit/JIT/AssertOptionsRuntimeStandaloneTest.php
php vendor/bin/phpunit --filter pipe_operator test/compliance/VMTest.php
php vendor/bin/phpunit --filter pipe_operator test/aot/AotTest.php
'

Output:

HELLO
HELLO
HELLO
OK (1 test, 20 assertions)  # AssertOptionsRuntimeStandalone
OK (5 tests, 6 assertions)  # VM pipe_operator compliance
OK (1 test, 5 assertions)   # AOT pipe_operator fixture

Test plan

• Issue repro "hello" |> strtoupper(...) on VM, JIT, AOT
• VM/JIT compliance pipe_operator matrix (5/5)
• AOT fixture pipe_operator.phpt (1/1)
• AssertOptionsRuntimeStandaloneTest LLVM module verify

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