Memory Profiler Incorrectly Reporting Data as Free

[milky2028]

Version of emscripten/emsdk:
3.1.54

It seems like after a certain point, the memory profiler begins to report allocated memory as "free," despite not actually showing that data as free in the numbered totals. It's possible this might not be a bug. In general, I think better explanations of what's going on with memory here might be needed.

You can see this in action by using this small app I built (repo) to allocate specified chunks of memory in wasm in megabytes.

[dschuff]

I think this is a question for @juj ?