Fix opcache path determination, again

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

Disable custom execute_ex during function JIT fuzzing as well

Having zend_execute_ex set is normally not a problem for the
function JIT, but there is an edge case leak due to special

Disable custom execute_ex during function JIT fuzzing as well

Having zend_execute_ex set is normally not a problem for the
function JIT, but there is an edge case leak due to special
RELEASE_THIS handling during generator creation. As this is an
unsupported mode of operation, reset to the original handler
for the function jit fuzzer as well.

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Make sure dummy file for fuzzing exists

Add fuzzer for tracing jit