Enable publishing of built artifacts via github releases.

Upload binaries of the translator to the github repo.

.travis.yml

@@ -109,3 +109,30 @@ script:
     else
       make $MAKE_TARGETS && make $MAKE_TEST_TARGET && if [ $BUILD_EXTERNAL == "1" ]; then make install; fi
     fi
+
+after_success:
+  # Create tarball for deployment
+  - if [[ "${BUILD_EXTERNAL}" == "1" && "${SHARED_LIBS}" == "ON" && "${repo_token}" != "" ]]; then
+      export TAG=7.0.1-1;
+      export TARBALL=SPIRV-LLVM-Translator-${TAG}-${TRAVIS_OS_NAME}-${BUILD_TYPE}.zip;
+      find ../install -print | zip -@ ${TARBALL};
+    fi
+
+before_deploy:
+  # Travis CI relies on the tag name to push to the correct release.
+  - git config --global user.name "Travis CI"
+  - git config --global user.email "builds@travis-ci.org"
+  - git tag -f ${TAG}
+  - git push https://${repo_token}@github.com/${TRAVIS_REPO_SLUG} --tags
+
+deploy:
+  provider: releases
+  api_key: ${repo_token}
+  on:
+    branch: llvm_release_70
+    condition: ${BUILD_EXTERNAL} == 1 && ${SHARED_LIBS} == ON && ${repo_token}
+  file: ${TARBALL}
+  skip_cleanup: true
+  overwrite: false
+  prerelease: false
+