Add Thread Sanitizer bot to Travis

.travis.yml

@@ -65,6 +65,16 @@ matrix:
             - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
             - LIBCXX_BUILD=1 LIBCXX_SANITIZER=MemoryWithOrigins
             - EXTRA_FLAGS="-stdlib=libc++ -g -O2 -fno-omit-frame-pointer -fsanitize=memory -fsanitize-memory-track-origins"
+        # Clang w/ libc++ and MSAN
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                clang-3.8
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
+            - LIBCXX_BUILD=1 LIBCXX_SANITIZER=Thread
+            - EXTRA_FLAGS="-stdlib=libc++ -g -O2 -fno-omit-frame-pointer -fsanitize=thread"
 
 before_script:
     - if [ -n "${LIBCXX_BUILD}" ]; then