[libcxx] r346369 - Fix -Wimplicit-fallthrough warning

[Fangrui Song]

Author: maskray
Date: Wed Nov  7 15:51:13 2018
New Revision: 346369

URL: http://llvm.org/viewvc/llvm-project?rev=346369&view=rev
Log:
Fix -Wimplicit-fallthrough warning

Reviewers: EricWF, ldionne, mclow.lists

Reviewed By: ldionne

Subscribers: christof, libcxx-commits

Differential Revision: https://reviews.llvm.org/D54234

Modified:
    libcxx/trunk/include/utility

Modified: libcxx/trunk/include/utility
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/utility?rev=346369&r1=346368&r2=346369&view=diff
==============================================================================
--- libcxx/trunk/include/utility (original)
+++ libcxx/trunk/include/utility Wed Nov  7 15:51:13 2018
@@ -989,8 +989,10 @@ __murmur2_or_cityhash<_Size, 32>::operat
     {
     case 3:
         __h ^= __data[2] << 16;
+        _LIBCPP_FALLTHROUGH();
     case 2:
         __h ^= __data[1] << 8;
+        _LIBCPP_FALLTHROUGH();
     case 1:
         __h ^= __data[0];
         __h *= __m;