Added LLVM_FALLTHROUGH to address warning: this statement may fall through. NFC.

llvm-svn: 304650
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index d523a0f..c21cd3f 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1576,6 +1576,7 @@
            getSubExpr()->getType()->isBlockPointerType());
     assert(getType()->getPointeeType().getAddressSpace() !=
            getSubExpr()->getType()->getPointeeType().getAddressSpace());
+    LLVM_FALLTHROUGH;
   // These should not have an inheritance path.
   case CK_Dynamic:
   case CK_ToUnion:
@@ -2102,6 +2103,7 @@
     }
 
     // Fallthrough for generic call handling.
+    LLVM_FALLTHROUGH;
   }
   case CallExprClass:
   case CXXMemberCallExprClass: