fuzzer support for FreeBSD, getting opcache location

Closes GH-7926.

Support specifying start position in compile_string

Add additional zend_compile_position argument, which can be either
AT_SHEBANG, AT_OPEN_TAG or AFTER_OPEN_TAG. The previous behavior

Support specifying start position in compile_string

Add additional zend_compile_position argument, which can be either
AT_SHEBANG, AT_OPEN_TAG or AFTER_OPEN_TAG. The previous behavior
corresponds to AFTER_OPEN_TAG.

Closes GH-7462.

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Consistently set bailed_out flag

It was not set for some of the bailouts, resulting in timeouts
in the function JIT fuzzer.

Fixes oss-fuzz #39293.

Fix opcache path determination, again

We shouldn't be appending to the executable path, but rather to
the directory of the executable.

Try to fetch opcache.so path relative to binary

While the cwd-relative lookup worked for the oss-fuzz docker images,
it doesn't seem to work on the cluster infrastructure. Try finding

Try to fetch opcache.so path relative to binary

While the cwd-relative lookup worked for the oss-fuzz docker images,
it doesn't seem to work on the cluster infrastructure. Try finding
opcache.so relative to the binary instead.

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Make sure dummy file for fuzzing exists

Add fuzzer for tracing jit

Add fuzzer for function JIT

This is a basic fuzzer for the function JIT, which looks for
crashes and sanitizer violations only, and does not try to detect
differing behavior yet.