Add support for **= in opcache optimizer

Author: bwoebi

ext/opcache/Optimizer/block_pass.c

@@ -1866,6 +1866,7 @@ static void zend_t_usage(zend_code_block *block, zend_op_array *op_array, zend_b
 					case ZEND_ASSIGN_SUB:
 					case ZEND_ASSIGN_MUL:
 					case ZEND_ASSIGN_DIV:
+					case ZEND_ASSIGN_POW:
 					case ZEND_ASSIGN_MOD:
 					case ZEND_ASSIGN_SL:
 					case ZEND_ASSIGN_SR:

ext/opcache/Optimizer/compact_literals.c

@@ -263,6 +263,7 @@ void zend_optimizer_compact_literals(zend_op_array *op_array, zend_optimizer_ctx
 				case ZEND_ASSIGN_SUB:
 				case ZEND_ASSIGN_MUL:
 				case ZEND_ASSIGN_DIV:
+				case ZEND_ASSIGN_POW:
 				case ZEND_ASSIGN_MOD:
 				case ZEND_ASSIGN_SL:
 				case ZEND_ASSIGN_SR:

ext/opcache/Optimizer/pass2.c

@@ -45,6 +45,7 @@ void zend_optimizer_pass2(zend_op_array *op_array)
 			case ZEND_SUB:
 			case ZEND_MUL:
 			case ZEND_DIV:
+			case ZEND_POW:
 				if (ZEND_OP1_TYPE(opline) == IS_CONST) {
 					if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
 						convert_scalar_to_number(&ZEND_OP1_LITERAL(opline));
@@ -55,6 +56,7 @@ void zend_optimizer_pass2(zend_op_array *op_array)
 			case ZEND_ASSIGN_SUB:
 			case ZEND_ASSIGN_MUL:
 			case ZEND_ASSIGN_DIV:
+			case ZEND_ASSIGN_POW:
 				if (opline->extended_value != 0) {
 					/* object tristate op - don't attempt to optimize it! */
 					break;

ext/opcache/Optimizer/zend_optimizer.c

@@ -234,6 +234,7 @@ void zend_optimizer_update_op2_const(zend_op_array *op_array,
 			case ZEND_ASSIGN_SUB:
 			case ZEND_ASSIGN_MUL:
 			case ZEND_ASSIGN_DIV:
+			case ZEND_ASSIGN_POW:
 			case ZEND_ASSIGN_MOD:
 			case ZEND_ASSIGN_SL:
 			case ZEND_ASSIGN_SR:
@@ -253,6 +254,7 @@ void zend_optimizer_update_op2_const(zend_op_array *op_array,
 				     (opline-1)->opcode == ZEND_ASSIGN_SUB ||
 				     (opline-1)->opcode == ZEND_ASSIGN_MUL ||
 				     (opline-1)->opcode == ZEND_ASSIGN_DIV ||
+				     (opline-1)->opcode == ZEND_ASSIGN_POW ||
 				     (opline-1)->opcode == ZEND_ASSIGN_MOD ||
 				     (opline-1)->opcode == ZEND_ASSIGN_SL ||
 				     (opline-1)->opcode == ZEND_ASSIGN_SR ||