Fix the two gmoules-prefered-name-* tests

Add missing "REQUIRES: asserts" for the two tests added in commit
711a644 (Diff: D145803).

Reviewed By: chapuni

Differential Revision: https://reviews.llvm.org/D147764

(cherry picked from commit 53d8b59)

Author: yozhu

clang/test/Modules/gmodules-preferred-name-alias.cpp

@@ -1,3 +1,4 @@
+// REQUIRES: asserts
 // RUN: rm -rf %t
 // RUN: %clang_cc1 -std=c++11 -dwarf-ext-refs -fmodule-format=obj \
 // RUN:     -fmodule-map-file=%S/Inputs/gmodules-preferred-name-alias.modulemap \

clang/test/Modules/gmodules-preferred-name-typedef.cpp

@@ -1,3 +1,4 @@
+// REQUIRES: asserts
 // RUN: rm -rf %t
 // RUN: %clang_cc1 -std=c++11 -dwarf-ext-refs -fmodule-format=obj \
 // RUN:     -fmodule-map-file=%S/Inputs/gmodules-preferred-name-typedef.modulemap \