Merge branch 'PHP-7.4'

* PHP-7.4:
  Support for exceptions thrown during "Array to string conversion" error processing
  Reduce over-specialization for quite seldom instructions

diff --cc Zend/zend_execute.c
Simple merge

diff --cc Zend/zend_operators.c
Simple merge

diff --cc Zend/zend_vm_def.h
Simple merge

diff --cc Zend/zend_vm_execute.h
Simple merge