Roll HarfBuzz to 1.3.1

third_party/harfbuzz-ng/src/hb-set-private.hh

Index: third_party/harfbuzz-ng/src/hb-set-private.hh
diff --git a/third_party/harfbuzz-ng/src/hb-set-private.hh b/third_party/harfbuzz-ng/src/hb-set-private.hh
index 3c302b1daf68eb8d6381c27a9d40d0b5c4e62889..e2010d762672c6f495c901a9599cedf323dc425f 100644
--- a/third_party/harfbuzz-ng/src/hb-set-private.hh
+++ b/third_party/harfbuzz-ng/src/hb-set-private.hh
@@ -313,7 +313,7 @@ struct hb_set_t
     for (unsigned int i = 0; i < ELTS; i++)
       if (elts[i])
 	for (unsigned int j = 0; j < BITS; j++)
-	  if (elts[i] & (1 << j))
+	  if (elts[i] & (1u << j))
 	    return i * BITS + j;
     return INVALID;
   }
@@ -322,7 +322,7 @@ struct hb_set_t
     for (unsigned int i = ELTS; i; i--)
       if (elts[i - 1])
 	for (unsigned int j = BITS; j; j--)
-	  if (elts[i - 1] & (1 << (j - 1)))
+	  if (elts[i - 1] & (1u << (j - 1)))
 	    return (i - 1) * BITS + (j - 1);
     return INVALID;
   }