JIT: Fix memory lek

Fixes oss-fuzz #46462

Author: dstogov

ext/opcache/jit/zend_jit_x86.dasc

@@ -4940,7 +4940,10 @@ static int zend_jit_math_helper(dasm_State    **Dst,
 		|	FREE_OP op1_type, op1, op1_info, 0, opline
 		|	FREE_OP op2_type, op2, op2_info, 0, opline
 		if (may_throw) {
-			if (Z_MODE(res_addr) == IS_MEM_ZVAL && Z_REG(res_addr) == ZREG_RX) {
+			if (opline->opcode == ZEND_ASSIGN_DIM_OP && (opline->op2_type & (IS_VAR|IS_TMP_VAR))) {
+				|	MEM_OP2_1_ZTS cmp, aword, executor_globals, exception, 0, r0
+				|	jne ->exception_handler_free_op2
+			} else if (Z_MODE(res_addr) == IS_MEM_ZVAL && Z_REG(res_addr) == ZREG_RX) {
 				zend_jit_check_exception_undef_result(Dst, opline);
 			} else {
 				zend_jit_check_exception(Dst);

ext/opcache/tests/jit/mul_009.phpt

@@ -0,0 +1,20 @@
+--TEST--
+JIT MUL: 009 memory leak
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+opcache.protect_memory=1
+--FILE--
+<?php
+$x[""][] = 1;
+$x[~"$y"] *= 1;
+?>
+--EXPECTF--
+Warning: Undefined variable $y in %smul_009.php on line 3
+
+Fatal error: Uncaught TypeError: Unsupported operand types: array * int in %smul_009.php:3
+Stack trace:
+#0 {main}
+  thrown in %smul_009.php on line 3