Export zend_unary_op_produces_error() and use in optimizer

Don't repeat this logic, as it's going to become more complex.

Author: nikic

Zend/Optimizer/zend_optimizer.c

@@ -64,11 +64,7 @@ int zend_optimizer_eval_unary_op(zval *result, zend_uchar opcode, zval *op1) /*
 	unary_op_type unary_op = get_unary_op(opcode);
 
 	if (unary_op) {
-		if (opcode == ZEND_BW_NOT
-		 && Z_TYPE_P(op1) != IS_LONG
-		 && Z_TYPE_P(op1) != IS_DOUBLE
-		 && Z_TYPE_P(op1) != IS_STRING) {
-			/* produces "Unsupported operand types" exception */
+		if (zend_unary_op_produces_error(opcode, op1)) {
 			return FAILURE;
 		}
 		return unary_op(result, op1);

Zend/zend_compile.c

@@ -8223,7 +8223,7 @@ static inline bool zend_try_ct_eval_binary_op(zval *result, uint32_t opcode, zva
 }
 /* }}} */
 
-bool zend_unary_op_produces_error(uint32_t opcode, zval *op)
+ZEND_API bool zend_unary_op_produces_error(uint32_t opcode, zval *op)
 {
 	if (opcode == ZEND_BW_NOT) {
 		return Z_TYPE_P(op) <= IS_TRUE || Z_TYPE_P(op) == IS_ARRAY;

Zend/zend_compile.h

@@ -1163,5 +1163,6 @@ END_EXTERN_C()
 #define ZEND_COMPILE_DEFAULT_FOR_EVAL			0
 
 ZEND_API bool zend_binary_op_produces_error(uint32_t opcode, zval *op1, zval *op2);
+ZEND_API bool zend_unary_op_produces_error(uint32_t opcode, zval *op);
 
 #endif /* ZEND_COMPILE_H */