Silence a bunch of implicit fallthrough warnings

llvm-svn: 321115
diff --git a/clang/utils/TableGen/NeonEmitter.cpp b/clang/utils/TableGen/NeonEmitter.cpp
index 49c1edce..e63f3e1 100644
--- a/clang/utils/TableGen/NeonEmitter.cpp
+++ b/clang/utils/TableGen/NeonEmitter.cpp
@@ -773,19 +773,19 @@
       break;
     case 'h':
       Float = true;
-    // Fall through
+      LLVM_FALLTHROUGH;
     case 's':
       ElementBitwidth = 16;
       break;
     case 'f':
       Float = true;
-    // Fall through
+      LLVM_FALLTHROUGH;
     case 'i':
       ElementBitwidth = 32;
       break;
     case 'd':
       Float = true;
-    // Fall through
+      LLVM_FALLTHROUGH;
     case 'l':
       ElementBitwidth = 64;
       break;