Make the StartProfilingAfterOsr profiler test more robust

1. Set profiling interval to 100us to get 10x the samples
2. Guarantee we spend at least 1ms per iteration, instead of only
bailing out if we spend more than 1ms. This gives us enough samples on
release mode.
3. Increase the time spent profiling optimized code

Bug: v8:10996
Change-Id: I1348ebce48fe998e79b5847f3e3d037148302dcc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2460823Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70403}

test/cctest/test-cpu-profiler.cc

@@ -2223,11 +2223,10 @@ static const char* pre_profiling_osr_script = R"(
         // doptimize OSRs.
         if (pass == optDuration) whenPass = () => {};
         whenPass(pass, optDuration);
-        for (let i = 0; i < 1e5; i++) {
+        while (Date.now() - startTime < pass) {
           for (let j = 0; j < 1000; j++) {
             x = Math.random() * j;
           }
-          if ((Date.now() - startTime) > pass) break;
         }
       }
     }
@@ -2265,10 +2264,11 @@ TEST(StartProfilingAfterOsr) {
   v8::Local<v8::Context> env = CcTest::NewContext({PROFILER_EXTENSION_ID});
   v8::Context::Scope context_scope(env);
   ProfilerHelper helper(env);
+  helper.profiler()->SetSamplingInterval(100);
   CompileRun(pre_profiling_osr_script);
   v8::Local<v8::Function> function = GetFunction(env, "notHot");
 
-  int32_t profiling_optimized_ms = 80;
+  int32_t profiling_optimized_ms = 120;
   int32_t profiling_deoptimized_ms = 40;
   v8::Local<v8::Value> args[] = {
       v8::Integer::New(env->GetIsolate(), profiling_optimized_ms),