Merge branch 'scalar_type_hints_v5' of github.com:ircmaxell/php-src into scalar_type_...

* 'scalar_type_hints_v5' of github.com:ircmaxell/php-src: (54 commits)
  Add check for maintaining reference all the way through both type and return values
  Reduce the number of times that the zval needs to be separated in return type checking to those that are necessary
  Add test to ensure namespaced code can't use scalar types as class names
  Disallow relative namespace type declarations
  Add support and tests for null constant default values. Refactor complex conditionals into an extracted function for clarity and code-reuse
  Refactor as to not use call info, but add the flag to the op_array.
  Fix severity issues with callbacks, start work porting ZEND_STRLEN opcode to work with strict mode, more refactoring to come
  Fix C89 compatibility by moving a misplaced if statement
  Refactor gotos into more elaborate ifs to eliminate goto failure
  Fix return type separation with references. It now includes a check in the opcode handler and properly separates the value in both cases
  Add error case with invalid type declaration default value
  Add tests for using constants as defaults with scalar type declarations
  Refactor error messages to only append defined in the event of rendering as a fatal error. Fix relative typehints to not work
  Revert gd and mysqli to former calls for arg count errors. Fix first identified issues with zend_compile.c from nikic. Add tests for generator returns prior to first yield
  Style cleanup, as well as fixing bug with missing argument for WRONG_PARAM_COUNT_WITH_RETVAL
  Clean up API renames for zend_wrong_param_count to maintain BC, introducing a zend_wrong_param_count_ex() function when you know strict value
  Fix executor issue with ignoring strict types, which cleans up a bunch of errors. Additionally fix the expected error of 2 unrelated tests that was caused by a change to the core error messages
  Fix more tests, improve error messages in failure output for thrown exception
  Refactor error implementation significantly to centralize error mode behavior. Add zend_internal_type_error() function
  Refactor declare placement detection, allow encoding declares before type declares
  ...

diff --cc Zend/zend_compile.c
Simple merge

diff --cc Zend/zend_execute.c
Simple merge