Remove commented code in pass1

This has been disabled for a long time, and the whole optimization
is no longer relevant given changes in PHP 8.1

Author: nikic

Zend/Optimizer/pass1.c

@@ -25,7 +25,6 @@
  * - constant expression evaluation
  * - optimize constant conditional JMPs
  * - pre-evaluate constant function calls
- * - eliminate FETCH $GLOBALS followed by FETCH_DIM/UNSET_DIM/ISSET_ISEMPTY_DIM
  */
 
 #include "php.h"
@@ -531,52 +530,6 @@ void zend_optimizer_pass1(zend_op_array *op_array, zend_optimizer_ctx *ctx)
 				zend_optimizer_collect_constant(ctx, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline));
 			}
 			break;
-#if 0
-		/* see ext/opcache/tests/bug78961.phpt */
-//		case ZEND_FETCH_R:
-		case ZEND_FETCH_W:
-//		case ZEND_FETCH_RW:
-		case ZEND_FETCH_IS:
-//		case ZEND_FETCH_FUNC_ARG:
-		case ZEND_FETCH_UNSET:
-			/* convert FETCH $GLOBALS (global), FETCH_DIM $x into FETCH $x (global) */
-			if ((opline->extended_value & ZEND_FETCH_GLOBAL) != 0 &&
-			    opline->op1_type == IS_CONST &&
-			    Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING &&
-			    zend_string_equals_literal(Z_STR(ZEND_OP1_LITERAL(opline)), "GLOBALS") &&
-			    ((opline + 1)->opcode == opline->opcode + 1 ||
-			     ((opline + 1)->opcode == ZEND_UNSET_DIM &&
-			      opline->opcode == ZEND_FETCH_UNSET) ||
-			     ((opline + 1)->opcode == ZEND_ISSET_ISEMPTY_DIM_OBJ &&
-			      opline->opcode == ZEND_FETCH_IS)) &&
-			    (opline + 1)->op1_type == opline->result_type &&
-			    (opline + 1)->op1.var == opline->result.var &&
-			    ((opline + 1)->op2_type != IS_CONST ||
-			     Z_TYPE(ZEND_OP2_LITERAL(opline + 1)) < IS_ARRAY)) {
-
-				if ((opline + 1)->opcode == ZEND_UNSET_DIM) {
-					(opline + 1)->opcode = ZEND_UNSET_VAR;
-					(opline + 1)->extended_value = ZEND_FETCH_GLOBAL;
-				} else if ((opline + 1)->opcode == ZEND_ISSET_ISEMPTY_DIM_OBJ) {
-					(opline + 1)->opcode = ZEND_ISSET_ISEMPTY_VAR;
-					(opline + 1)->extended_value |= ZEND_FETCH_GLOBAL;
-				} else {
-					(opline + 1)->opcode = opline->opcode;
-					(opline + 1)->extended_value = ZEND_FETCH_GLOBAL;
-				}
-				(opline + 1)->op1_type = (opline + 1)->op2_type;
-				(opline + 1)->op1 = (opline + 1)->op2;
-				if ((opline + 1)->op1_type == IS_CONST &&
-				    Z_TYPE(ZEND_OP1_LITERAL(opline + 1)) != IS_STRING) {
-
-					convert_to_string(&ZEND_OP1_LITERAL(opline + 1));
-					zend_string_hash_val(Z_STR(ZEND_OP1_LITERAL(opline + 1)));
-				}
-				SET_UNUSED((opline + 1)->op2);
-				MAKE_NOP(opline);
-			}
-			break;
-#endif
 
 		case ZEND_JMPZ_EX:
 		case ZEND_JMPNZ_EX: