Add nacl-clang testing to SCons

tests/toolchain/nacl.scons

Index: tests/toolchain/nacl.scons
diff --git a/tests/toolchain/nacl.scons b/tests/toolchain/nacl.scons
index 97dcc9fbddff973832ee684e0f6fe73b5ce127b4..00664dc4e229caac4b3cd23de55f053a5aa154a1 100644
--- a/tests/toolchain/nacl.scons
+++ b/tests/toolchain/nacl.scons
@@ -26,7 +26,10 @@ if env.Bit('bitcode'):
   env.Append(CCFLAGS=['-allow-asm'])
 
 # Test C++11 code with both supported C++ standard libraries.
-cpp11_libs = ['libstdc++', 'libc++']
+cpp11_libs = ['libc++']
+if env.Bit('bitcode'):
+  # PNaCl still supports libstdc++ but nacl-clang does not.
+  cpp11_libs.append('libstdc++')
 cpp11_envs = {}
 for lib in cpp11_libs:
   cpp11_envs[lib] = env.Clone()
@@ -86,7 +89,7 @@ AddIntrinsicTest(env, 'synchronization_sync.c', '0',
                              not env.Bit('bitcode')) or
                             env.IsRunningUnderValgrind()))
 AddIntrinsicTest(env, 'synchronization_volatile.c', '0')
-if env.Bit('bitcode'):
+if env.Bit('bitcode') or env.Bit('nacl_clang'):
   # The following tests were only made to work on LLVM for
   # PNaCl. Command-line flags and libraries need to be updated for GCC
   # support.
@@ -109,7 +112,7 @@ if env.Bit('bitcode'):
 
 # This test redirects C function calls to llvm instrinsic functions,
 # so they only work w/ PNaCl.
-if env.Bit('bitcode'):
+if env.Bit('bitcode') or env.Bit('nacl_clang'):
   AddIntrinsicTest(env, 'llvm_bitmanip_intrinsics.c', '0',
                    golden_file=env.File('llvm_bitmanip_intrinsics.stdout'))
   AddIntrinsicTest(env, 'llvm_math_intrinsics.c', '0',
@@ -248,6 +251,7 @@ def MakeEnv(env, use_opts, use_frames):
 EH_ENVIRONMENTS_TO_TRY = []
 
 base_eh_env = env.Clone()
+
 supports_cxx11 = env.Bit('bitcode') or env.Bit('target_arm')
 base_eh_env.Append(CPPDEFINES=[['SUPPORTS_CXX11', str(int(supports_cxx11))]])
 if supports_cxx11: