feat: support fastly:runtime#vCpuTime function

Author: Guy Bedford

integration-tests/js-compute/fixtures/app/src/runtime.js

@@ -8,12 +8,9 @@ import { vCpuTime } from "fastly:runtime";
 
 routes.set("/runtime/get-vcpu-ms", () => {
   const cpuTime = vCpuTime();
-  console.log(cpuTime);
   strictEqual(typeof cpuTime, 'number');
-  console.log('3');
   ok(cpuTime > 0);
   ok(cpuTime < 1000);
-  console.log('4');
   const arr = [];
   for (let i = 0; i < 1000; i++) {
     arr.push(i);
@@ -22,5 +19,5 @@ routes.set("/runtime/get-vcpu-ms", () => {
   ok(cpuTime2 > cpuTime);
   ok(cpuTime2 - cpuTime > 1);
   ok(cpuTime2 - cpuTime < 1000);
-  return pass();
+  return pass('ok');
 });

runtime/fastly/builtins/fastly.cpp

@@ -227,7 +227,6 @@ bool runtime_get_vcpu_time(JSContext *cx, unsigned argc, JS::Value *vp) {
     HANDLE_ERROR(cx, *err);
     return false;
   }
-  fprintf(stderr, "GOT: %llu", res.unwrap());
   args.rval().setNumber(res.unwrap());
   return true;
 }