[TSan][NFC] fixup for comment of Shadow

There should be 1-bit unused field between tid field and is_atomic field of Shadow.

Reviewed By: dvyukov, vitalybuka

Differential Revision: https://reviews.llvm.org/D119417

diff --git a/compiler-rt/lib/tsan/rtl-old/tsan_shadow.h b/compiler-rt/lib/tsan/rtl-old/tsan_shadow.h
index 8b7bc34..566584f 100644 (file)
--- a/compiler-rt/lib/tsan/rtl-old/tsan_shadow.h
+++ b/compiler-rt/lib/tsan/rtl-old/tsan_shadow.h
@@ -94,6 +94,7 @@ class FastState {
 // Shadow (from most significant bit):
 //   freed           : 1
 //   tid             : kTidBits
+//   unused          : 1
 //   is_atomic       : 1
 //   is_read         : 1
 //   size_log        : 2