* PHP-7.4:
  Also support absolute Windows filenames

The output normalization of bless_tests.php only detected absolute Unix
filenames; we extend this for absolute Windows filenames, regardless of
the platform we're running on (tests may have been run on Windows, but
bless_tests.php may be run from WSL or a Linux VM, for instance).

RFC: https://wiki.php.net/rfc/arithmetic_operator_type_checks

Closes GH-5331.

Compute the diff between the old EXPECTF and the new output and
don't touch lines that still match the old EXPECTF. This reduces
the amount of manual fixup necessary after running bless_tests.php.

Resources used as array keys are generally handled by throwing a
notice and converting the resource to the resource handle. The only
exception is the [$resource => null] syntax, where this was treated
as an illegal offset type instead. However, this also only happened
for VM evaluations, the AST evaluator did handle resources correctly.

Similar to what is done for socket read/write errors.

If a string var_dump contains a wildcard, also make the length a
wildcard.

Or a mix of multiple directories/files. Also make the file executable.

Helper script to perform certain kinds of trivial test updates.