[ASan][Darwin] Avoid crash during ASan initialization
Always pass `depth=1` to `vm_region_recurse_64()`. `depth` is a in-out
parameter and gets reset to 0 after the first call, so we incorrectly
pass `depth=0` on subsequent calls.
We want to avoid the following crash:
```
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000180000000
Exception Codes: 0x0000000000000001, 0x0000000180000000
VM Region Info: 0x180000000 is not in any region. Bytes after previous region:
277577729 Bytes before following region:
384270336
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
Stack
16f64c000-
16f748000 [ 1008K] rw-/rwx SM=PRV thread 0
---> GAP OF 0x27730000 BYTES
unused shlib __TEXT
196e78000-
196eac000 [ 208K] r-x/r-x SM=COW ... this process
Termination Reason: SIGNAL 11 Segmentation fault: 11
Terminating Process: exc handler [767]
```
Crashing code:
```
static mach_header *get_dyld_image_header() {
unsigned depth = 1;
vm_size_t size = 0;
vm_address_t address = 0;
kern_return_t err = KERN_SUCCESS;
mach_msg_type_number_t count = VM_REGION_SUBMAP_INFO_COUNT_64;
while (true) {
struct vm_region_submap_info_64 info;
err = vm_region_recurse_64(mach_task_self(), &address, &size, &depth,
(vm_region_info_t)&info, &count);
if (err != KERN_SUCCESS) return nullptr;
if (size >= sizeof(mach_header) && info.protection & kProtectionRead) {
mach_header *hdr = (mach_header *)address;
if ((hdr->magic == MH_MAGIC || hdr->magic == MH_MAGIC_64) && // << CRASH: sanitizer_procmaps_mac.cpp:176
hdr->filetype == MH_DYLINKER) {
return hdr;
}
}
address += size;
}
}
```
Radar-Id: rdar://problem/
86773501
Differential Revision: https://reviews.llvm.org/D116240