[XRay][compiler-rt] Relocate a DCHECK to the correct location.

deanberris · deanberris · commit 238aa1366e8c · 2018-05-14T04:21:12.000Z
Fixes a bad DCHECK where the condition being checked is still valid (for
iterators pointing to sentinels).

Follow-up to D45756.

llvm-svn: 332212
diff --git a/compiler-rt/lib/xray/xray_segmented_array.h b/compiler-rt/lib/xray/xray_segmented_array.h
@@ -143,10 +143,11 @@ struct Array {
     Iterator(Chunk *IC, size_t Off) : C(IC), Offset(Off) {}
 
     Iterator &operator++() {
-      DCHECK_NE(C, &SentinelChunk);
       if (++Offset % N)
         return *this;
 
+      DCHECK_NE(C, &SentinelChunk);
+
       // At this point, we know that Offset % N == 0, so we must advance the
       // chunk pointer.
       DCHECK_EQ(Offset % N, 0);
