Simplified, faster implementation of Benchmark.realtime [Alexander Dymo]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8771 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/core_ext/benchmark.rb

+require 'benchmark'
+
+module Benchmark
+  remove_method :realtime
+  def realtime
+    r0 = Time.now
+    yield
+    r1 = Time.now
+    r1.to_f - r0.to_f
+  end
+  module_function :realtime
+end
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