Add perf testing

Author: j-f1

.github/workflows/perf.yml

@@ -0,0 +1,23 @@
+name: Performance
+
+on: [pull_request]
+
+jobs:
+  perf:
+    runs-on: Ubuntu-18.04
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+      with:
+        fetch-depth: 1
+    - name: Run Benchmark
+      run: |
+        git clone https://github.com/kylef/swiftenv.git ~/.swiftenv
+        export SWIFTENV_ROOT="$HOME/.swiftenv"
+        export PATH="$SWIFTENV_ROOT/bin:$PATH"
+        eval "$(swiftenv init -)"
+        swiftenv install $TOOLCHAIN_DOWNLOAD
+        node perf-tester/index.js
+      env:
+        TOOLCHAIN_DOWNLOAD: https://github.com/swiftwasm/swift/releases/download/swift-wasm-5.3-SNAPSHOT-2020-08-10-a/swift-wasm-5.3-SNAPSHOT-2020-08-10-a-linux.tar.gz
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Makefile

@@ -22,3 +22,7 @@ benchmark_setup:
 .PHONY: run_benchmark
 run_benchmark:
 	cd IntegrationTests && make -s run_benchmark
+
+.PHONY: perf-tester
+perf-tester:
+	cd perf-tester && npm install && npm run build