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Previously Time.now was switched to use Time.new as it added support for
the in: argument. Unfortunately because Class#new is a cfunc this
requires always allocating a Hash.
This commit switches Time.now back to using a builtin time_s_now. This
avoids the extra Hash allocation and is about 3x faster.
$ benchmark-driver -e './ruby;3.1::~/.rubies/ruby-3.1.0/bin/ruby;3.0::~/.rubies/ruby-3.0.2/bin/ruby' benchmark/time_now.yml
Warming up --------------------------------------
Time.now 6.704M i/s - 6.710M times in 1.000814s (149.16ns/i, 328clocks/i)
Time.now(in: "+09:00") 2.003M i/s - 2.112M times in 1.054330s (499.31ns/i)
Calculating -------------------------------------
./ruby 3.1 3.0
Time.now 7.693M 2.763M 6.394M i/s - 20.113M times in 2.614428s 7.278710s 3.145572s
Time.now(in: "+09:00") 2.030M 1.260M 1.617M i/s - 6.008M times in 2.960132s 4.769378s 3.716537s
Comparison:
Time.now
./ruby: 7693129.7 i/s
3.0: 6394109.2 i/s - 1.20x slower
3.1: 2763282.5 i/s - 2.78x slower
Time.now(in: "+09:00")
./ruby: 2029757.4 i/s
3.0: 1616652.3 i/s - 1.26x slower
3.1: 1259776.2 i/s - 1.61x slower
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