[build] Shuffle render tests in 'test-node-recycle-map' target

[brunoabinader]

Enables shuffling render tests when recycling the map object.

I've let it running continuously throughout the last weekend using the following command without any additional issues found:

$ true; while [ $? -eq 0 ]; do node platform/node/test/render.test.js --recycle-map --shuffle; done

So far we've solved all of the bugs (and bugfixes) found while running this technique. #9978 is the last one open, which is fixed in #9931.

Depends on: #9931.

[brunoabinader]

Additional note: In Node render tests, when --shuffle option is passed without --seed, a random-generated seed is designated. This seed is shown on the command line in runtime prior to start running the tests.

Render tests in node6-clang39-debug have the shuffling+recycled map option enabled in its render tests, thus if a failure is catch, we can reproduce it by re-running the tests using the given seed mentioned above.

[brunoabinader]

This is how you obtain the random seed generated:

(This particular test run succeeded because the shuffled test sequence did not triggered the flow described in #9978).

[lbud]

🍝