[compiler-rt] Migrate to _zx_clock_get_new/_zx_clock_get_monotonic

[phosek]

Summary

This is part of the soft-transition to the new _zx_clock_get signature.

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

static void internal_nanosleep(zx_time_t ns) {
   CHECK_EQ(status, ZX_OK);
 }
 
 unsigned int internal_sleep(unsigned int seconds) {
   internal_nanosleep(ZX_SEC(seconds));
   return 0;
 }
 
-u64 NanoTime() { return _zx_clock_get(ZX_CLOCK_UTC); }
+u64 NanoTime() {
+  zx_time_t time;
+  zx_status_t status = _zx_clock_get_new(ZX_CLOCK_UTC, &time);
+  CHECK_EQ(status, ZX_OK);
+  return time;
+}
 
-u64 MonotonicNanoTime() { return _zx_clock_get(ZX_CLOCK_MONOTONIC); }
+u64 MonotonicNanoTime() { return _zx_clock_get_monotonic(); }
 
 uptr internal_getpid() {
   zx_info_handle_basic_t info;
   zx_status_t status =
       _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &info,
                           sizeof(info), NULL, NULL);
   CHECK_EQ(status, ZX_OK);
   uptr pid = static_cast<uptr>(info.koid);