Fix JIT crash with large number of match/switch arms (#8961)

Switch statements may generate a large number of exit points. Once the max
number of exit points is reached, get_exit_addr() returns NULL. This was not
checked, and this resulted in a jump table with some 0 addresses.

Author: arnaud-lb

.editorconfig

@@ -9,7 +9,7 @@ end_of_line              = lf
 charset                  = utf-8
 tab_width                = 4
 
-[{*.{awk,bat,c,cpp,d,h,l,re,skl,w32,y},Makefile*}]
+[{*.{awk,bat,c,cpp,d,dasc,h,l,re,skl,w32,y},Makefile*}]
 indent_size              = 4
 indent_style             = tab
 

ext/opcache/jit/zend_jit_arm64.dasc

@@ -13992,6 +13992,9 @@ static int zend_jit_hash_jmp(dasm_State **Dst, const zend_op *opline, const zend
 			} else {
 				exit_point = zend_jit_trace_get_exit_point(target, 0);
 				exit_addr = zend_jit_trace_get_exit_addr(exit_point);
+				if (!exit_addr) {
+					return 0;
+				}
 				|	.addr &exit_addr
 			}
 		}
@@ -14154,6 +14157,9 @@ static int zend_jit_switch(dasm_State **Dst, const zend_op *opline, const zend_o
 							} else {
 								exit_point = zend_jit_trace_get_exit_point(target, 0);
 								exit_addr = zend_jit_trace_get_exit_addr(exit_point);
+								if (!exit_addr) {
+									return 0;
+								}
 								|	.addr &exit_addr
 							}
 						}

ext/opcache/jit/zend_jit_x86.dasc

@@ -14877,6 +14877,9 @@ static int zend_jit_hash_jmp(dasm_State **Dst, const zend_op *opline, const zend
 			} else {
 				exit_point = zend_jit_trace_get_exit_point(target, 0);
 				exit_addr = zend_jit_trace_get_exit_addr(exit_point);
+				if (!exit_addr) {
+					return 0;
+				}
 				|	.aword &exit_addr
 			}
 		}
@@ -15043,6 +15046,9 @@ static int zend_jit_switch(dasm_State **Dst, const zend_op *opline, const zend_o
 							} else {
 								exit_point = zend_jit_trace_get_exit_point(target, 0);
 								exit_addr = zend_jit_trace_get_exit_addr(exit_point);
+								if (!exit_addr) {
+									return 0;
+								}
 								|	.aword &exit_addr
 							}
 						}