[libc++] Expand Android libc++ test config files

Parameterize (and rename) existing libc++/libc++abi test configuration
files for the Android NDK to work for both the NDK and platform.

Android LLVM downstream seeks to test libc++ for both the NDK and
platform build (currently only testing the NDK), which will use almost
identical test configuration files. The only difference is the name of
the libc++ shared object used. Because of this we parameterize the
current test files (for both libc++ and libc++abi) with the existing
LIBCXX_SHARED_OUTPUT_NAME cmake variable, and rename the file
accordingly.

Author: tynasello-google

libcxx/cmake/caches/AndroidNDK.cmake

@@ -33,5 +33,5 @@ set(CMAKE_CXX_COMPILER_WORKS ON CACHE BOOL "")
 
 # Use adb to push tests to a locally-connected device (e.g. emulator) and run
 # them.
-set(LIBCXX_TEST_CONFIG "llvm-libc++-android-ndk.cfg.in" CACHE STRING "")
-set(LIBCXXABI_TEST_CONFIG "llvm-libc++abi-android-ndk.cfg.in" CACHE STRING "")
+set(LIBCXX_TEST_CONFIG "llvm-libc++-android.cfg.in" CACHE STRING "")
+set(LIBCXXABI_TEST_CONFIG "llvm-libc++abi-android.cfg.in" CACHE STRING "")

libcxx/test/configs/llvm-libc++-android-ndk.cfg.in renamed to libcxx/test/configs/llvm-libc++-android.cfg.in

@@ -1,5 +1,5 @@
 # This testing configuration handles running the test suite against LLVM's
-# libc++ using adb and a libc++_shared.so library on Android.
+# libc++ using adb on Android.
 
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
@@ -27,11 +27,11 @@ if re.match(r'i686-linux-android(21|22|23)$', config.target_triple):
     compile_flags += ' -mstackrealign'
 config.substitutions.append(('%{compile_flags}', compile_flags))
 
-# The NDK library is called "libc++_shared.so". Use LD_LIBRARY_PATH to find
-# libc++_shared.so because older Bionic dynamic loaders don't support rpath
-# lookup.
+# The platform library is called "libc++.so" and the NDK library is called "libc++_shared.so". 
+# Use LD_LIBRARY_PATH to find the libcxx shared object because older Bionic dynamic loaders 
+# don't support rpath lookup.
 config.substitutions.append(('%{link_flags}',
-    '-nostdlib++ -L %{lib-dir} -lc++_shared'
+    '-nostdlib++ -L %{lib-dir} -l@LIBCXX_SHARED_OUTPUT_NAME@'
 ))
 config.substitutions.append(('%{exec}',
     '%{executor}' +

libcxxabi/test/configs/llvm-libc++abi-android-ndk.cfg.in renamed to libcxxabi/test/configs/llvm-libc++abi-android.cfg.in

@@ -1,5 +1,5 @@
 # This testing configuration handles running the test suite against LLVM's
-# libc++abi using adb and a libc++_shared.so library on Android.
+# libc++abi using adb on Android.
 
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
@@ -19,12 +19,12 @@ config.substitutions.append(('%{compile_flags}',
     '-nostdinc++ -I %{include} -I %{cxx-include} -I %{cxx-target-include} %{maybe-include-libunwind} -I %{libcxx}/test/support -I %{libcxx}/src -D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS'
 ))
 
-# The NDK library is called "libc++_shared.so". Use LD_LIBRARY_PATH to find
-# libc++_shared.so because older Bionic dynamic loaders don't support rpath
-# lookup. The Android libc++ shared library exports libc++abi, so we don't need
-# to link with -lc++abi.
+# The platform library is called "libc++.so" and the NDK library is called "libc++_shared.so". 
+# Use LD_LIBRARY_PATH to find the libcxx shared object because older Bionic dynamic loaders 
+# don't support rpath lookup. The Android libc++ shared library exports libc++abi, so we 
+# don't need to link with -lc++abi.
 config.substitutions.append(('%{link_flags}',
-    '-nostdlib++ -L %{lib} -lc++_shared'
+    '-nostdlib++ -L %{lib} -l@LIBCXX_SHARED_OUTPUT_NAME@'
 ))
 config.substitutions.append(('%{exec}',
     '%{executor}' +