node: fix erroneously named function call

The initial implementation of setPropByIndex() set the value of an Array
by index during development. Though the final form of the function
simply pushes passed values to an array as passed by arguments. Thus the
functions have been renamed to pushValueToArray() and
push_values_to_array_function() respectively.

Also add define for maximum number of arguments should be used before
hitting the limit of performance increase.

Fixes: 494227bb "node: improve GetActiveRequests performance"
PR-URL: https://github.com/nodejs/node/pull/3780


Reviewed-By: Fedor Indutny <fedor@indutny.com>