Look into supporting opcache optimization without opcode caching

[TysonAndre]

This would conceptually be the same as opcache.file_cache being empty or unwritable and opcache.file_cache_only=1?

• See opcache_compile_file, file_cache_compile_file
• Currently, opcache will emit a fatal error on startup if files or directories can't be created

Check if this reduces the memory need while maintaining optimizations

Check that files can be required multiple times and behave as expected

Check if this is being worked on by others with different approaches.

ext/opcache/zend_file_cache.c - A placeholder could be added for all non-static methods that reports all saving succeeded and all loading failed?