Merge branch 'PHP-7.4'

* PHP-7.4:
  Implement #78270: Support __vectorcall convention with FFI

diff --cc ext/ffi/ffi.c
Simple merge

diff --cc ext/ffi/ffi.g
Simple merge

diff --cc ext/ffi/ffi_parser.c
Simple merge

diff --cc ext/ffi/php_ffi.h
Simple merge