Fix: AOT get_headers insert-block restore (#27317)

[PurHur]

Summary

• GetHeadersRuntime::implement now saves/restores the caller LLVM insert block after emitting __compiler_get_headers (same pattern as Inet/Ftok Regression: AOT ip2long()/long2ip() compile fails — Current basic block has no parent function (ext/standard/basic_functions.c) #27088), so mid-script BasicBlockHelper::append no longer throws Current basic block has no parent function.
• Adds repro + AOT fixture for refused loopback @get_headers(...) === false.
• Closes Regression: AOT get_headers() compile fails — basic block has no parent (ext/standard/head.c) #27317

php-src reference

• ext/standard/head.c — PHP_FUNCTION(get_headers)
• PHP fix: lib/JIT/Builtin/GetHeadersRuntime.php (php-in-PHP bridge; no new C)

Test plan

• Issue repro AOT compile + run
• VM/JIT unchanged (true)
• Unit: GetHeadersJitRuntimeShrinkTest|GetHeadersRuntimeStandaloneTest
• AOT fixture: get_headers_refused_connection

Verification transcript

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_gap_aot_get_headers.php'
# true
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/jit.php test/repro/maintainer_gap_aot_get_headers.php'
# true
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/compile.php -o build/get_headers_aot test/repro/maintainer_gap_aot_get_headers.php && build/get_headers_aot'
# true (COMPILE_EXIT:0 RUN:0)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php -d memory_limit=1536M vendor/bin/phpunit --filter "GetHeadersJitRuntimeShrinkTest|GetHeadersRuntimeStandaloneTest"'
# OK (6 tests, 19 assertions)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php -d memory_limit=1536M vendor/bin/phpunit --group aot --filter get_headers_refused_connection'
# OK (1 test, 5 assertions)

Not covered this PR: full ci-fast / north-star5-verify-fast (master already red on helper-runtime prelink + gen-0 manifest mismatch — noted on #10533).

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