tools, test: fix prof polyfill readline

`node --prof foo.js` may not print the full profile log file, leaving
the last line broken (for example `tick,`. When that happens, `readline`
will be stuck in an infinite loop. This patch fixes it.

Also introduced `common.isCPPSymbolsNotMapped` to avoid duplicated code
on tick-processor tests.

PR-URL: https://github.com/nodejs/node/pull/18641


Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>