Add comparison to bang-method benchmark

Author: jonas-schulze

benchmarks/bang-methods.rb

@@ -13,7 +13,8 @@ def merge(array)
 
 puts RUBY_DESCRIPTION
 
-Benchmark.bm(10) do |x|
-  x.report("merge!") { merge!(array) }
-  x.report("merge")  { merge(array)  }
+Benchmark.bm(10, "m VS m!") do |x|
+  m_bang = x.report("merge!") { merge!(array) }
+  m      = x.report("merge")  { merge(array)  }
+  [m / m_bang]
 end

reports/2.3.5/bang-methods.txt

@@ -1,4 +1,5 @@
 ruby 2.3.5p376 (2017-09-14 revision 59905) [x86_64-darwin17]
                  user     system      total        real
-merge!       0.010000   0.000000   0.010000 (  0.008554)
-merge       23.950000   0.960000  24.910000 ( 24.952244)
+merge!       0.010000   0.000000   0.010000 (  0.008765)
+merge       27.310000   1.110000  28.420000 ( 28.650144)
+m VS m!    2731.000000        Inf        NaN (3268.698675)

reports/2.5.0/bang-methods.txt

@@ -1,4 +1,5 @@
 ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
                  user     system      total        real
-merge!       0.006702   0.000773   0.007475 (  0.007487)
-merge        0.582605   0.748508   1.331113 (  1.336501)
+merge!       0.006785   0.000719   0.007504 (  0.007511)
+merge        0.631501   0.781163   1.412664 (  1.418696)
+m VS m!     93.073102 1086.457580        NaN (188.882438)