We must not use the same shared memory OPcache instance for different
SAPIs, since their memory layout is different.  To avoid this, we add
the SAPI name (truncated to at most 20 characters) to the names of the
memory base file, the mutex and the file mapping.

Opcache stores `opline->handler`s in shared memory.  These pointers are
invalid, if the main PHP DLL is loaded at another base address due to
ASLR.  We therefore store the address of `execute_ex` in the mmap base
file, and check on startup whether it matches its current address.  If
not, we fall back on the file cache if enabled, and bail out otherwise.

This still does not address cases where the opline handler is located
inside of another DLL (e.g. for some profilers, debuggers), but there
seems to be no general solution for now.

(cherry picked from commit 8ba10b8fbc020dc225d3b19d8f088f1351a3e304)

It's not safe to change value of ZCG(accel_directives).file_cache_only, becuse it might be altered by INI subsystem.
Use global variable instead.

* PHP-7.0:
  Split requested size as expected by CreateFileMapping.

Thus fixing ext\opcache\tests\log_verbosity_bug.phpt fails on 64-bit.

* PHP-7.0:
  improve/fix error handling