Do not assume RLIM_INFINITY is always (rlim_t)-1in sanitizers code

[kutuzov.viktor.84]

Summary

On FreeBSD it is defined as:

#define RLIM_INFINITY ((rlim_t)(((uint64_t)1) << 63) - 1))

[samsonov]

LGTM

Closed by commit rL217308 (authored by vkutuzov).

compiler-rt/trunk/lib/sanitizer_common/sanitizer_posix_libcdep.cc

 void DisableCoreDumperIfNecessary() {
   if (common_flags()->disable_coredump) {
     setlim(RLIMIT_CORE, 0);
   }
 }
 
 bool StackSizeIsUnlimited() {
   rlim_t stack_size = getlim(RLIMIT_STACK);
-  return (stack_size == (rlim_t)-1);
+  return (stack_size == RLIM_INFINITY);
 }
 
 void SetStackSizeLimitInBytes(uptr limit) {
   setlim(RLIMIT_STACK, (rlim_t)limit);
   CHECK(!StackSizeIsUnlimited());
 }
 
 bool AddressSpaceIsUnlimited() {
   rlim_t as_size = getlim(RLIMIT_AS);
-  return (as_size == (rlim_t)-1);
+  return (as_size == RLIM_INFINITY);
 }
 
 void SetAddressSpaceUnlimited() {
-  setlim(RLIMIT_AS, -1);
+  setlim(RLIMIT_AS, RLIM_INFINITY);
   CHECK(AddressSpaceIsUnlimited());
 }
 
 void SleepForSeconds(int seconds) {
   sleep(seconds);
 }
 
 void SleepForMillis(int millis) {