JIT: Fix register clobbering

Fixes oss-fuzz #45590

Author: dstogov

ext/opcache/jit/zend_jit_x86.dasc

@@ -15877,6 +15877,9 @@ static zend_regset zend_jit_get_scratch_regset(const zend_op *opline, const zend
 				if (op1_info & MAY_BE_DOUBLE) {
 					regset = ZEND_REGSET(ZREG_XMM0);
 				}
+				if (opline->result_type != IS_UNUSED && (op1_info & MAY_BE_LONG)) {
+					ZEND_REGSET_INCL(regset, ZREG_R1);
+				}
 			}
 			break;
 		case ZEND_ADD:

ext/opcache/tests/jit/reg_alloc_014.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Register Alloction 014: Register clobbering
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+--FILE--
+<?php
+function foo() {
+    for($cnt = 0; $cnt < 6; $cnt++) {
+        $e = $a-- + $a-- + $a *= $a;
+        for ($i = 0; $i <= .1; $i++);
+    }
+}
+foo();
+?>
+DONE
+--EXPECTF--
+Warning: Undefined variable $a in %sreg_alloc_014.php on line 4
+DONE