check for mountSpan before starting

Author: AbhiPrasad

packages/react/src/profiler.tsx

@@ -55,7 +55,7 @@ class Profiler extends React.Component<ProfilerProps> {
     }
 
     const activeSpan = getActiveSpan();
-    if (activeSpan) {
+    if (activeSpan && !this._mountSpan) {
       this._mountSpan = startInactiveSpan({
         name: `<${name}>`,
         op: REACT_MOUNT_OP,
@@ -80,7 +80,7 @@ class Profiler extends React.Component<ProfilerProps> {
       // See what props haved changed between the previous props, and the current props. This is
       // set as data on the span. We just store the prop keys as the values could be potenially very large.
       const changedProps = Object.keys(updateProps).filter(k => updateProps[k] !== this.props.updateProps[k]);
-      if (changedProps.length > 0) {
+      if (changedProps.length > 0 && !this._updateSpan) {
         const now = timestampInSeconds();
         this._updateSpan = startInactiveSpan({
           name: `<${this.props.name}>`,