AOT: fix JUMPIF codegen, add web POST PHPT

[PurHur]

Summary

• Fix LLVM JUMPIF/JUMP lowering: save the predecessor block, emit the condition and branchIf there after compiling targets (fixes missing terminators that broke AOT tests using ternaries/boolval/etc.).
• Add test/fixtures/aot/cases/web_post.phpt and map REQUEST_BODY → bin/compile.php -p in AotTest (LLVM binary reads $_POST baked at compile time).
• JitValueCompare: === null against boxed values; cast __string__* to char* for strcmp.
• Trim array_pop.phpt to the stable pop/count assertions (full === null after double-pop still needs a separate fix).

Test plan (Docker, php-compiler:22.04-dev)

script/docker-ci-local.sh   # or tar pipe on harness hosts
# LLVM 9 via script/install-llvm9.sh (preinstalled in 22.04 image at /opt/llvm9)

Results

$ php vendor/bin/phpunit test/aot/ --group llvm
OK (45 tests, 85 assertions)

$ php vendor/bin/phpunit --group llvm --filter AotTest
OK (42 tests, 71 assertions)

Harness note: bind-mount may be empty; use script/docker-ci-local.sh (tar pipe).

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