Update Clang for rebase to r212749.

This also fixes a small issue with arm_neon.h not being generated always.

Includes a cherry-pick of:
r213450 - fixes mac-specific header issue
r213126 - removes a default -Bsymbolic on Android

Change-Id: I2a790a0f5d3b2aab11de596fc3a74e7cbc99081d
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 66a8cab..fe80df4 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -29,10 +29,16 @@
   c-index-test diagtool arcmt-test c-arcmt-test
   clang-check clang-format
   clang-tblgen
-  clang-interpreter
-  PrintFunctionNames
-  SampleAnalyzerPlugin
   )
+
+if (ENABLE_CLANG_EXAMPLES)
+  list(APPEND CLANG_TEST_DEPS
+    clang-interpreter
+    PrintFunctionNames
+    SampleAnalyzerPlugin
+    )
+endif ()
+
 set(CLANG_TEST_PARAMS
   clang_site_config=${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
   )