Add Travis builds with undefined behavior sanitizer

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

.travis.yml

@@ -36,13 +36,13 @@ matrix:
           env: CONFIG_OPTS="-fsanitize=address"
         - os: linux
           compiler: clang-3.6
-          env: CONFIG_OPTS="--debug --strict-warnings -fsanitize=address"
+          env: CONFIG_OPTS="no-asm --debug --strict-warnings -fno-sanitize-recover -fsanitize=address -fsanitize=undefined"
         - os: linux
           compiler: gcc-5
           env: CONFIG_OPTS="-fsanitize=address"
         - os: linux
           compiler: gcc-5
-          env: CONFIG_OPTS="--debug --strict-warnings -fsanitize=address"
+          env: CONFIG_OPTS="no-asm --debug --strict-warnings -fno-sanitize-recover -fsanitize=address -fsanitize=undefined"
     exclude:
         - os: osx
           compiler: clang-3.6