Preserve readable stacktraces

Author: mgreter

script/ci-build-libsass

@@ -58,9 +58,9 @@ fi
 if [ "x$CC" == "xclang" ]; then
   if [ "x$COVERAGE" != "xyes" ]; then
     if [ "$TRAVIS_OS_NAME" == "linux" ]; then
-      export EXTRA_CFLAGS="$EXTRA_CFLAGS -fsanitize=address"
-      export EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS -fsanitize=address"
-      export EXTRA_LDFLAGS="$EXTRA_LDFLAGS -fsanitize=address"
+      export EXTRA_CFLAGS="$EXTRA_CFLAGS -g -fsanitize=address"
+      export EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS -g -fsanitize=address"
+      export EXTRA_LDFLAGS="$EXTRA_LDFLAGS -g -fsanitize=address"
     fi
   fi
 fi