Print js/Infinity, js/-Infinity, js/NaN using new reader literals

fixed https://github.com/clojure/clojurescript/commit/d45012273029bd5df3973ea716394f368e1c44cc

The benchmarks added focus on printing booleans and numbers, since
this is where the change was. It also adds a test for an empty JavaScript
object, since this is the first branch after the changed code.

A summary of the speedup is given for each value type and each engine,
followed by the full details.

Perhaps the two perf regressions that might be important for this candidate
change are slowdown of printing regular numbers in V8 (but perhaps that is
outweighed by the 1.40 speedup getting to everything else after the
code—the (js-obj) test, and general
slowdown for things after the code—the (js-obj) test—for
JavaScriptCore.

Before:

After: