[lldb-tests] Force system's libcxx on tests failing with debug symbols

The tests in this patch expose failures of LLDBs expression evaluator
when a standard library is compiled with debug symbols. This is the case
for RelWithDebugInfo builds of llvm-project (with libcxx).

Until these bugs are fixed, we force these tests to use the system's
standard library.

Differential Revision: https://reviews.llvm.org/D139361

Author: felipepiovezan

lldb/test/API/commands/expression/import-std-module/deque-dbg-info-content/Makefile

@@ -1,3 +1,5 @@
-USE_LIBCPP := 1
+# FIXME: once the expression evaluator can handle std libraries with debug
+# info, change this to USE_LIBCPP=1
+USE_SYSTEM_STDLIB := 1
 CXX_SOURCES := main.cpp
 include Makefile.rules

lldb/test/API/commands/expression/import-std-module/list-dbg-info-content/Makefile

@@ -1,3 +1,5 @@
-USE_LIBCPP := 1
+# FIXME: once the expression evaluator can handle std libraries with debug
+# info, change this to USE_LIBCPP=1
+USE_SYSTEM_STDLIB := 1
 CXX_SOURCES := main.cpp
 include Makefile.rules

lldb/test/API/commands/expression/import-std-module/vector-dbg-info-content/Makefile

@@ -1,3 +1,5 @@
-USE_LIBCPP := 1
+# FIXME: once the expression evaluator can handle std libraries with debug
+# info, change this to USE_LIBCPP=1
+USE_SYSTEM_STDLIB := 1
 CXX_SOURCES := main.cpp
 include Makefile.rules