[lldb] Build libcxx unique_ptr and shared_ptr test programs with -glldb.

The functionality added by https://reviews.llvm.org/D145803 is gated by
lldb tuning, so we need to build the test programs with `-glldb` to make
these tests print the expected preferred name.

Differential Revision: https://reviews.llvm.org/D148582

Author: slackito

lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/shared_ptr/Makefile

@@ -2,5 +2,7 @@ CXX_SOURCES := main.cpp
 
 USE_LIBCPP := 1
 
-CXXFLAGS_EXTRAS := -std=c++14
+# We need debug info tuning for lldb in order to emit the preferred name for
+# std::string. See https://reviews.llvm.org/D145803.
+CXXFLAGS_EXTRAS := -std=c++14 -glldb
 include Makefile.rules

lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/unique_ptr/Makefile

@@ -2,5 +2,7 @@ CXX_SOURCES := main.cpp
 
 USE_LIBCPP := 1
 
-CXXFLAGS_EXTRAS := -std=c++14
+# We need debug info tuning for lldb in order to emit the preferred name for
+# std::string. See https://reviews.llvm.org/D145803.
+CXXFLAGS_EXTRAS := -std=c++14 -glldb
 include Makefile.rules