Env flag affects the peak memory in e2e benchmark.

[qjia7]

Steps to reproduce:

1. Access https://tensorflow.github.io/tfjs/e2e/benchmarks/local-benchmark/index.html
2. Use the default backend wasm and click Run benchmark.
3. See the left table

Peak memory	19.63 MB

4. Switch to webgl backend. Change any flags, for example webgl pack. And then switch back to wasm.
5. Click Run benchmark again. The peak memory increases as below:

Peak memory	33.51 MB

6. If we repeat 4 and 5, you will find the peak memory gets bigger and bigger. However, if you don't change the flag, the peak memory won't change. It happens for all backends that the flag will affect the peak memory. It seems like a bug.

[qjia7]

fyi @lina128. This is the issue that I mentioned in yesterday's meeting.

[gaikwadrahul8]

Hi, @qjia7

Apologize for the delayed response and we're re-visiting our older issues and checking whether those issues got resolved or not as of now and I tried from my end and still this issue exists so May I know are you still looking for the solution ? Thank you!

For your reference I have added screenshot below:

[qjia7]

I expect it can be resolved since it's a bug.