Support higher CPU profiler sampling rate on posix systems

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index 6b02368816e540f10a45b1938822b713ab6d16e9..2c3ec36a7bc119a90d22899d6fa0fbfb6fda18fc 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -333,7 +333,7 @@ class SampleRateCalculator {
  public:
   SampleRateCalculator()
       : result_(Logger::kSamplingIntervalMs * kResultScale),
-        ticks_per_ms_(Logger::kSamplingIntervalMs),
+        ticks_per_ms_(1.0 / Logger::kSamplingIntervalMs),
         measurements_count_(0),
         wall_time_query_countdown_(1) {
   }