[test] Make msan work for v8 stand-alone.

DEPS

 # Note: The buildbots evaluate this file with CWD set to the parent
 # directory and assume that the root of the checkout is in ./v8/, so
 # all paths in here must match this assumption.
 
 vars = {
   "git_url": "https://chromium.googlesource.com",
 }
 
 deps = {
   "v8/build/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "82b08049cc0b1f9e0bdcc0702ac6b523360f635f",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "4e3266f32c62d30a3f9e2232a753c60129d1e670",
   "v8/buildtools":
     Var("git_url") + "/chromium/buildtools.git" + "@" + "451dcd05a5b34936f5be67b2472cd63aaa508401",
   "v8/testing/gtest":
     Var("git_url") + "/external/googletest.git" + "@" + "8245545b6dc9c4703e6496d1efd19e975ad2b038",  # from svn revision 700
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "29763965ab52f24565299976b936d1265cb6a271",  # from svn revision 501
+  "v8/third_party/libc++/trunk":
+     Var("git_url") + "/chromium/llvm-project/libcxx.git" + "@" + "48198f9110397fff47fe7c37cbfa296be7d44d3d",
+  "v8/third_party/libc++abi/trunk":
+     Var("git_url") + "/chromium/llvm-project/libcxxabi.git" + "@" + "4ad1009ab3a59fa7a6896d74d5e4de5885697f95",
   "v8/tools/clang":
     Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "24bed8c99d57ebfad05890c21f03f31af39dc6d4",
 }
 
 deps_os = {
   "android": {
     "v8/third_party/android_tools":
       Var("git_url") + "/android_tools.git" + "@" + "4f723e2a5fa5b7b8a198072ac19b92344be2b271",
   },
   "win": {
@@ skipping 56 matching lines @@
     'name': 'clang',
     'pattern': '.',
     'action': ['python', 'v8/tools/clang/scripts/update.py', '--if-needed'],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "v8/build/gyp_v8"],
   },
 ]